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GMC C15 Muffler

We have 5 Items In-stock. Select a year to continue.
$47.37 List Price $68.14 Save $20.77 Availability: In Stock
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Walker's SoundFX mufflers feature a sophisticated pipe routing and tuning technology that provides better flow and favorable OE-style sound. Their all-aluminized construction provides longer service life and quality appearance.

Features:
  • OE-style sound
  • Aluminized steel muffler material

Specifications:

  • 21 in. L x 9.75 in. W x 4.25 in. H, 26.5 in. overall length
  • Single offset inlet and offset outlet configuration
  • 2.5 in. inlet diameter
  • 2.25 in. outlet diameter
  • Oval body shape
  • Modifications and/or additional parts required
  • SKU#: WK17845
  • Brand: Walker
  • Fit Note: 117.5 in. Wheelbase, 131.5 in. Wheelbase, Without Converter, 131.5 in. Wheelbase, DIESEL, 117.5 in. Wheelbase, Without Converter, Dual Exhaust, DIESEL, 131.5 in. Wheelbase, Without Converter, Dual Exhaust, GAS, 117.5 in. Wheelbase, With Single Catalytic Converter, Single Outlet, Without Converter, GAS, 131.5 in. Wheelbase, With Single Catalytic Converter, Single Outlet, Without Converter, Late Models With 2 1/4 in. O.D. Tail Pipe, With Single Catalytic Converter, Without Converter
  • Product Fit: Minor Modifications
  • Quantity Sold: Sold Individually
  • Sound Level: Stock
  • Recommended Use: OE Replacement
  • Anticipated Ship Out Time: Same day - 1 business day
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Fits the following GMC C15 Years:
  • 1978 | 8 Cyl 5.7L | Base, Heavy Half, High Sierra, Sierra Classic, Sierra Grande, Street Coupe
  • 1977 | 8 Cyl 5.0L | Indy Hauler
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$90.61 List Price $152.87 Save $62.26 Availability: In Stock
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GIBSON – SUPERFLOW MUFFLERS

Gibson’s Superflow mufflers are dyno-proven to dramatically increase the performance of your low to mid-range RPMs due to their Convergent Flow technology and straight design that makes exhaust flow more efficiently. Gibson is known as the leading manufacturer of street-legal, high performance exhaust systems for trucks, SUVs, diesels, off-road vehicles and RVs.

  • Most reliable, trouble-free and affordable muffler available - period
  • Deep, rich big block sound outside and relatively quiet interior
  • Convergent Flow Technology means dramatically more efficient exhaust flow
  • Baffled and chambered design means optimal volumetric efficiency
  • Features straight design which improves exhaust flow to increase torque and horsepower
  • Dyno-tested
  • Direct fit by vehicle year, make and model
  • Made in America
  • Makes significant improvements in low to mid-range
  • Comes in universal oval, round or in a race muffler style
  • SKU#: G2755131
  • Brand: Gibson
  • Product Fit: Universal
  • Quantity Sold: Sold Individually
  • Sound Level: Aggressive
  • Recommended Use: Performance
  • Anticipated Ship Out Time: 1-2 Business Days
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Fits the following GMC C15 Years:
  • 1978 | 8 Cyl 7.4L | Base, Heavy Half, High Sierra, Sierra Classic, Sierra Grande, Street Coupe
  • 1975-1977 | All Engines | All Submodels
$57.04 List Price $113.96 Save $56.92 Availability: In Stock
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MUFFLER -- Stock Replacement, Original Equipment Quality, Sold Individually
  • SKU#: WK21784
  • Brand: Walker
  • Fit Note: 117.5 in. Wheelbase, Truck, Except California Emission System, 117.5 in. Wheelbase, Truck, 131.5 in. Wheelbase, Truck, Except California Emission System, 131.5 in. Wheelbase, Truck, Truck, Early Models, Truck
  • Quantity Sold: Sold Individually
  • Sound Level: Stock
  • Anticipated Ship Out Time: Same day - 1 business day
 
Fits the following GMC C15 Years:
  • 1978 | 6 Cyl 4.1L | Street Coupe
  • 1977-1978 | 6 Cyl 4.1L | Heavy Half
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$33.57 List Price $39.61 Save $6.04 Availability: In Stock
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Walker's SoundFX Mufflers feature a sophisticated pipe routing and tuning technology that provides better flow and favorable OE-style sound. Their all-aluminized construction provides longer service life and quality appearance.

Features:

  • OE-style sound
  • Aluminized steel muffler material
  • SKU#: WK17880
  • Brand: Walker
  • Fit Note: 117.5 in. Wheelbase, Except Carryall/Suburban/Panel And Dual Exhaust, 131.5 in. Wheelbase, Except Carryall/Suburban/Panel And Dual Exhaust, Except Carryall/Suburban/Panel And Dual Exhaust, Except Carryall/Suburban/Panel, With Catalytic Converter, Except Carryall/Suburban/Panel
  • Product Fit: Direct Fit
  • Quantity Sold: Sold Individually
  • Sound Level: Stock
  • Recommended Use: OE Replacement
  • Anticipated Ship Out Time: Same day - 1 business day
(see more)
Fits the following GMC C15 Years:
  • 1978 | 8 Cyl 5.7L | Street Coupe
  • 1977-1978 | 8 Cyl 5.7L | Heavy Half
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$49.67 List Price $73.82 Save $24.15 Availability: In Stock
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WALKER TRU-FIT MUFFLER

Walker's Tru-Fit muffler features a sophisticated pipe routing and tuning technology that provides better flow and favorable OE-style sound. Its all-aluminized construction provides longer service life and quality appearance.

Specifications
  • Aluminized steel muffler material
Features
  • OE-style sound
Notes
  • Tru-Fit muffler replaces muffler part number 21910
  • SKU#: WK18124
  • Brand: Walker
  • Fit Note: 117.5 in. Wheelbase, 131.5 in. Wheelbase, Without Converter, 131.5 in. Wheelbase, DIESEL, 117.5 in. Wheelbase, Without Converter, Dual Exhaust, DIESEL, 131.5 in. Wheelbase, Without Converter, Dual Exhaust, GAS, 117.5 in. Wheelbase, With Single Catalytic Converter, Single Outlet, Without Converter, GAS, 131.5 in. Wheelbase, With Single Catalytic Converter, Single Outlet, Without Converter, Late Models With 2 1/4 in. O.D. Tail Pipe, With Single Catalytic Converter, Without Converter
  • Product Fit: Direct Fit
  • Quantity Sold: Sold Individually
  • Sound Level: Stock
  • Anticipated Ship Out Time: Same day - 1 business day
 
Fits the following GMC C15 Years:
  • 1978 | 8 Cyl 5.7L | Base, Heavy Half, High Sierra, Sierra Classic, Sierra Grande, Street Coupe
  • 1977 | 8 Cyl 5.0L | Indy Hauler
(see more)