1998 GMC Exhaust Muffler Parts
Choose a Model for your 1998 GMC
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- DynoMax Ultra-Flo Welded Muffler
- Oval; 3.0 in. Inlet/Outlet; 4.5 in. H x 9.75 in. W x 14 in. Muffler L/19 in. Overall L; Center/Center; Reversible; Stainless Steel
- DynoMax Ultra Flo Welded Muffler
- Ultra Flo™ Welded Universal Muffler
-
Features:
- Constructed Using All 409 Stainless Steel
- 100% Welded Construction For Lifelong durability
- Unrestricted Straight-Through Design
- Dyno Proven To Flow Up To 2000 SCFM And Support Up To 2000 HP
- Exclusive Continuous Roving Fiberglass Technology
- CRF Technology Absorbs Unwanted Interior Resonance
- Maintains A Deep Performance Tone
- Straight-Through Design Ensures Unrestricted Exhaust Flow
- Reduces Back pressure
- Proudly Manufactured In The USA
- Limited Lifetime Warranty
- DynoMax(R) Ultra Flo(TM) Welded performance stainless steel mufflers feature 100-percent welded construction for lifelong durability. The unrestricted, straight-through design dyno proven to flow up to 2,000 SCFM and support up to 2,000 horsepower. Each muffler uses our exclusive Continuous Roving Fiberglass (CRF) Technology to absorb unwanted interior resonance while maintaining a deep performance tone. The 'Pure Unadulterated POWER' of DynoMax(R) Ultra Flo(TM) Welded mufflers are backed by a Limited Lifetime Warranty and exclusive 90-Day Performance & Sound Guarantee(TM).
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1998 - GMC C2500 Suburban | V | - | 8 Cyl 5.7L | 350 |
- DynoMax Super Turbo Muffler
- Universal; Oval; 4.25 in. x 9.75 in.; Side - Center; 2.5 in. ID; 14 in. Shell Length; 18.5 in. Overall Length
- DynoMax Super Turbo Muffler
- Super Turbo Muffler
-
Features:
- Exclusive Patented Flow Director Design Channels Exhaust Flow
- Eliminates Turbulence
- Large Internal Flow Tubes Improve Exhaust Flow
- Large Internal Flow Tubes Reduce Backpressure
- Fiberglass Matting Tech To Absorb Unwanted Interior Resonance
- Maintains A Mellow Performance Tone
- Dyno Proven To Flow Up To 700 SCFM/Support Up To 636 HP
- Proudly Manufactured In The USA
- Limited Lifetime Warranty
- DynoMax(R) Super Turbo(TM) performance mufflers exclusive patented flow director design channels exhaust flow and eliminates turbulence on most applications. The large internal flow tubes improve exhaust flow and reduce backpressure. Each muffler uses fiberglass matting technology to absorb unwanted interior resonance while maintaining a mellow performance tone. The 'Pure Unadulterated POWER' of DynoMax(R) Super Turbo(TM) mufflers are backed by a Limited Lifetime Warranty and exclusive 90-Day Performance & Sound Guarantee(TM).
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1998 - GMC Sonoma | V | - | 6 Cyl 4.3L | 262 |
- 40 Series™ Muffler
- 3.0 in. Offset Inlet/Outlet; Case Dimensions 4 in. x 9.75 in. x 13 in.; 19 in. Overall Length; Aluminized Steel Not Direct Fit-Some Adaptation Required
- 40 Series™ Muffler; 3.0 in. Offset Inlet/Outlet; Case Dimensions 4 in. x 9.75 in. x 13 in.; 19 in. Overall Length; Aluminized Steel;
- 40 Series(TM) Muffler
- Product Attributes:
- Tip Quantity: 0
- Automotive Item Grade: High Performance
- Muffler Type: Reflection
- Outlet Connection Type: Pipe
- Outlet Position: Offset
- Sound Level: Aggressive
- WARNING CA Proposition 65: No
- Fitment: Universal
- Body Width: 9.750 In.
- Muffler Series: 40 Series
- Main Piping Diameter: Oem
- Inlet Position: Offset
- Inlet Connection Type: Pipe
-
Features:
- Durable Fully Welded 16ga Aluminized Steel
- 3 Year Limited Warranty
- Aggressive And Powerful Exterior Exhaust Tone
- Notable Interior Resonance
- Excellent Street/Strip And Off Road Application
- No Internal Packing To Blowout
- The Original Two Chamber Design
- Premium Flowmaster Quality
- The Original 40 series muffler delivers an aggressive exterior and interior tone. If you're looking for that original Flowmaster sound this is the muffler is for you. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.
-
Suggested Purchase Quantity: 2
- Most jobs typically require 2 of this item.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1998 - GMC K1500 | V | - | 8 Cyl 5.0L | 305 |
- 2.25 in. Dual Inlet/3 in. Center Outlet; Case Dimensions 5 in. x 10 in. x 17 in.; 23 in. Overall Length; Aluminized Steel Not Direct Fit-Some Adaptation Required~Adapters Needed For OEM Exhaust
- 50 Series™ SUV Muffler; 2.25 in. Dual Inlet/3 in. Center Outlet; Case Dimensions 5 in. x 10 in. x 17 in.; 23 in. Overall Length; Aluminized Steel;
- 50 Series™ SUV Muffler
- Product Attributes:
- Tip Quantity: 0
- Automotive Item Grade: High Performance
- Muffler Type: Reflection
- Outlet Connection Type: Pipe
- Outlet Position: Center
- Inlet Diameter: 2.250 In.
- Sound Level: Mild
- WARNING CA Proposition 65: No
- Fitment: Universal
- Body Width: 10.000 In.
- Muffler Series: Super 50 Series
- Inlet Inside Diameter: 2.250 In.
- Main Piping Diameter: 2.250 In.
- Inlet Position: Dual
- Inlet Outside Diameter: 2.250 In.
- Inlet Connection Type: Pipe
-
Features:
- Durable Fully Welded 16ga Aluminized Steel
- 3 Year Limited Warranty
- Mild to Moderate Exterior Exhaust Tone
- Minimal Interior Resonance
- Excellent Choice for Large Displacement Vehicles
- Improved HP/TQ and Potential Mileage Improvement
- Race Proven Patented Delta Flow® Technology
- Premium Flowmaster Quality
- The Super 50 series muffler is a larger version of Flowmaster's 50 series Delta Flow(R) muffler. Originally designed for trucks and SUV's, it is also well suited to muscle car and high performance applications. In addition, the larger case size significantly reduces interior resonance and provides a deep, rich tone along with mileage and power gains. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.
-
Suggested Purchase Quantity: 2
- Most jobs typically require 2 of this item.
This Part Fits the Following OEM/Substitute Numbers:
12278
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1998 - GMC C2500 Suburban | V | - | 8 Cyl 7.4L | 454 |
- 50 Series™ SUV Muffler
- 2.25 in. Dual Inlet/3 in. Center Outlet; Case Dimensions 5 in. x 10 in. x 17 in.; 23 in. Overall Length; Aluminized Steel Not Direct Fit-Some Adaptation Required~Adapters Needed For OEM Exhaust
- 50 Series™ SUV Muffler; 2.25 in. Dual Inlet/3 in. Center Outlet; Case Dimensions 5 in. x 10 in. x 17 in.; 23 in. Overall Length; Aluminized Steel;
- 50 Series(TM) SUV Muffler
- Product Attributes:
- Tip Quantity: 0
- Automotive Item Grade: High Performance
- Muffler Type: Reflection
- Outlet Connection Type: Pipe
- Outlet Position: Center
- Inlet Diameter: 2.250 In.
- Sound Level: Mild
- WARNING CA Proposition 65: No
- Fitment: Universal
- Body Width: 10.000 In.
- Muffler Series: Super 50 Series
- Inlet Inside Diameter: 2.250 In.
- Main Piping Diameter: 2.250 In.
- Inlet Position: Dual
- Inlet Outside Diameter: 2.250 In.
- Inlet Connection Type: Pipe
-
Features:
- Durable Fully Welded 16ga Aluminized Steel
- 3 Year Limited Warranty
- Mild to Moderate Exterior Exhaust Tone
- Minimal Interior Resonance
- Excellent Choice for Large Displacement Vehicles
- Improved HP/TQ and Potential Mileage Improvement
- Race Proven Patented Delta Flow® Technology
- Premium Flowmaster Quality
- The Super 50 series muffler is a larger version of Flowmaster's 50 series Delta Flow(R) muffler. Originally designed for trucks and SUV's, it is also well suited to muscle car and high performance applications. In addition, the larger case size significantly reduces interior resonance and provides a deep, rich tone along with mileage and power gains. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.
-
Suggested Purchase Quantity: 2
- Most jobs typically require 2 of this item.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1998 - GMC Yukon | V | - | 8 Cyl 5.7L | 350 |
- 3.0 in. Offset Inlet/Outlet; Case Dimensions 4 in. x 9.75 in. x 13 in.; 19 in. Overall Length; Aluminized Steel Not Direct Fit-Some Adaptation Required
- 40 Series™ Muffler; 3.0 in. Offset Inlet/Outlet; Case Dimensions 4 in. x 9.75 in. x 13 in.; 19 in. Overall Length; Aluminized Steel;
- 40 Series™ Muffler
- Product Attributes:
- Tip Quantity: 0
- Automotive Item Grade: High Performance
- Muffler Type: Reflection
- Outlet Connection Type: Pipe
- Outlet Position: Offset
- Sound Level: Aggressive
- WARNING CA Proposition 65: No
- Fitment: Universal
- Body Width: 9.750 In.
- Muffler Series: 40 Series
- Main Piping Diameter: Oem
- Inlet Position: Offset
- Inlet Connection Type: Pipe
-
Features:
- Durable Fully Welded 16ga Aluminized Steel
- 3 Year Limited Warranty
- Aggressive And Powerful Exterior Exhaust Tone
- Notable Interior Resonance
- Excellent Street/Strip And Off Road Application
- No Internal Packing To Blowout
- The Original Two Chamber Design
- Premium Flowmaster Quality
- The Original 40 series muffler delivers an aggressive exterior and interior tone. If you're looking for that original Flowmaster sound this is the muffler is for you. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.
-
Suggested Purchase Quantity: 2
- Most jobs typically require 2 of this item.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1998 - GMC K1500 | V | - | 8 Cyl 5.0L | 305 |
- Super 40™ Delta Flow Muffler
- 3.0 in. Offset Inlet/Offset Outlet; Case Dimensions 5 in. x 10 in. x 13.5 in.; 17.5 in. Overall Length; 409 Stainless Steel Not Direct Fit-Some Adaptation Required
- Super 40™ Delta Flow Muffler; 3.0 in. Offset Inlet/Offset Outlet; Case Dimensions 5 in. x 10 in. x 13.5 in.; 17.5 in. Overall Length; 409 Stainless Steel;
- Super 40(TM) Delta Flow Muffler
- Product Attributes:
- Tip Quantity: 0
- Automotive Item Grade: High Performance
- Muffler Type: Reflection
- California Proposition 65 Chemical Name 2: Chromium (hexavalent Compounds)
- Outlet Connection Type: Pipe
- California Proposition 65 Chemical Name 1: Nickel (metallic)
- Outlet Position: Offset
- Sound Level: Aggressive
- WARNING CA Proposition 65: Yes
- Fitment: Universal
- Body Width: 10.000 In.
- Muffler Series: Super 40 Series
- Inlet Position: Offset
- Inlet Connection Type: Pipe
-
Features:
- Durable Fully Welded 16ga Stainless Steel
- Limited Lifetime Warranty
- Deep Aggressive to Moderate Exhaust Note
- Moderate Interior Resonance
- Excellent Performance On High Horsepower Vehicles
- Race Proven Patented Delta Flow® Technology
- No Internal Packing To Blowout
- Premium Flowmaster Quality
- Developed from our Top Ten race muffler lineup for use on the street/strip, the Super 40(R) features Flowmaster's Delta Flow(R) technology. It's larger case profile provides the best of both worlds of performance and sound, especially on forced induction and high horsepower vehicles. The Super 40 has that deep powerful sound of the Original 40 series but with all the benefits of performance and low interior resonance from the Delta Flow(R) technology. Constructed of 16 gauge 409S stainless steel and fully MIG welded for maximum durability.
-
Suggested Purchase Quantity: 2
- Most jobs typically require 2 of this item.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1998 - GMC C2500 | V | - | 8 Cyl 6.5L | 395 |
- Super 44™ Delta Flow Muffler
- 3.0 in. Offset Inlet/3 in. Opposite Side Offset Outlet; Case Dimensions 4 in. x 9.75 in. x 13 in.; 19 in. Overall Length; 409 Stainless Steel Not Direct Fit-Some Adaptation Required
- Super 44™ Delta Flow Muffler; 3.0 in. Offset Inlet/3 in. Opposite Side Offset Outlet; Case Dimensions 4 in. x 9.75 in. x 13 in.; 19 in. Overall Length; 409 Stainless Steel;
- Super 44(TM) Delta Flow Muffler
- Product Attributes:
- Tip Quantity: 0
- Automotive Item Grade: High Performance
- Muffler Type: Reflection
- California Proposition 65 Chemical Name 2: Chromium (hexavalent Compounds)
- Outlet Connection Type: Pipe
- California Proposition 65 Chemical Name 1: Nickel (metallic)
- Outlet Position: Offset
- Sound Level: Aggressive
- WARNING CA Proposition 65: Yes
- Fitment: Universal
- Body Width: 9.750 In.
- Muffler Series: Super 44 Series
- Main Piping Diameter: Oem
- Inlet Position: Offset
- Inlet Connection Type: Pipe
-
Features:
- Durable Fully Welded 16ga Stainless Steel
- Limited Lifetime Warranty
- Mild to Moderate Exterior Exhaust Tone
- Minimal Interior Resonance
- Excellent Choice For Street Rods Cars and Trucks
- Improved HP/TQ and Potential Mileage Improvement
- Race Proven Patented Delta Flow® Technology
- Premium Flowmaster Quality
- Recent Two Chamber Improvement
- Flowmaster's Super 44 muffler uses the same Delta Flow(R) technology found in our larger Super 40 mufflers. The Super 44 delivers a rich powerful tone and are the most aggressive, highest performing street muffler we've ever built in a four inch case. Constructed of 16 gauge 409S stainless steel and fully MIG welded for maximum durability.
-
Suggested Purchase Quantity: 2
- Most jobs typically require 2 of this item.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1998 - GMC Yukon | V | - | 8 Cyl 5.7L | 350 |
- 3.0 in. Offset Inlet/Offset Outlet; Case Dimensions 5 in. x 10 in. x 13.5 in.; 17.5 in. Overall Length; 409 Stainless Steel Not Direct Fit-Some Adaptation Required
- Super 40™ Delta Flow Muffler; 3.0 in. Offset Inlet/Offset Outlet; Case Dimensions 5 in. x 10 in. x 13.5 in.; 17.5 in. Overall Length; 409 Stainless Steel;
- Super 40™ Delta Flow Muffler
- Product Attributes:
- Tip Quantity: 0
- Automotive Item Grade: High Performance
- Muffler Type: Reflection
- Outlet Connection Type: Pipe
- Outlet Position: Offset
- Sound Level: Aggressive
- WARNING CA Proposition 65: Yes
- Fitment: Universal
- Body Width: 10.000 In.
- Muffler Series: Super 40 Series
- Inlet Position: Offset
- Inlet Connection Type: Pipe
-
Features:
- Durable Fully Welded 16ga Stainless Steel
- Limited Lifetime Warranty
- Deep Aggressive to Moderate Exhaust Note
- Moderate Interior Resonance
- Excellent Performance On High Horsepower Vehicles
- Race Proven Patented Delta Flow® Technology
- No Internal Packing To Blowout
- Premium Flowmaster Quality
- Developed from our Top Ten race muffler lineup for use on the street/strip, the Super 40(R) features Flowmaster's Delta Flow(R) technology. It's larger case profile provides the best of both worlds of performance and sound, especially on forced induction and high horsepower vehicles. The Super 40 has that deep powerful sound of the Original 40 series but with all the benefits of performance and low interior resonance from the Delta Flow(R) technology. Constructed of 16 gauge 409S stainless steel and fully MIG welded for maximum durability.
-
Suggested Purchase Quantity: 2
- Most jobs typically require 2 of this item.
This Part Fits the Following OEM/Substitute Numbers:
953048
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1998 - GMC K2500 | V | - | 8 Cyl 6.5L | 395 |
- 3.0 in. Offset Inlet/3 in. Opposite Side Offset Outlet; Case Dimensions 4 in. x 9.75 in. x 13 in.; 19 in. Overall Length; 409 Stainless Steel Not Direct Fit-Some Adaptation Required
- Super 44™ Delta Flow Muffler; 3.0 in. Offset Inlet/3 in. Opposite Side Offset Outlet; Case Dimensions 4 in. x 9.75 in. x 13 in.; 19 in. Overall Length; 409 Stainless Steel;
- Super 44™ Delta Flow Muffler
- Product Attributes:
- Tip Quantity: 0
- Automotive Item Grade: High Performance
- Muffler Type: Reflection
- Outlet Connection Type: Pipe
- Outlet Position: Offset
- Sound Level: Aggressive
- WARNING CA Proposition 65: Yes
- Fitment: Universal
- Body Width: 9.750 In.
- Muffler Series: Super 44 Series
- Main Piping Diameter: Oem
- Inlet Position: Offset
- Inlet Connection Type: Pipe
-
Features:
- Durable Fully Welded 16ga Stainless Steel
- Limited Lifetime Warranty
- Mild to Moderate Exterior Exhaust Tone
- Minimal Interior Resonance
- Excellent Choice For Street Rods Cars and Trucks
- Improved HP/TQ and Potential Mileage Improvement
- Race Proven Patented Delta Flow® Technology
- Premium Flowmaster Quality
- Recent Two Chamber Improvement
- Flowmaster's Super 44 muffler uses the same Delta Flow(R) technology found in our larger Super 40 mufflers. The Super 44 delivers a rich powerful tone and are the most aggressive, highest performing street muffler we've ever built in a four inch case. Constructed of 16 gauge 409S stainless steel and fully MIG welded for maximum durability.
-
Suggested Purchase Quantity: 2
- Most jobs typically require 2 of this item.
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1998 - GMC K2500 | V | - | 8 Cyl 5.0L | 305 |
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