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GMC K15 Mufflers

This page brings together exhaust mufflers for the GMC K15 covering model years 1975–1978, with direct-fit and OE replacement options in aluminized steel from a range of established exhaust brands. Select your year above and we'll show only the mufflers that fit your GMC K15. Fitment is checked against our vehicle data for every part listed.

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Picture of Flowmaster Super 40 Series Chambered Muffler

Flowmaster Super 40 Series Chambered Muffler

48 reviews
Vehicle Specific
from $137
In Stock (10+)
Picture for manufacturer Flowmaster
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What's here for your GMC K15

  • Exhaust mufflers in aluminized steel construction
  • Direct-fit, OE-style replacement designs
  • Options across multiple exhaust brands serving 1975–1978 fitments

The widest selection here comes from Walker Exhaust, AP Exhaust, Bosal, and Ansa, each offering exhaust mufflers designed to match original mounting and pipe dimensions for this generation of GMC K15. Other categories GMC K15 owners shop for: GMC K15 Steering Wheels, GMC K15 Exhaust and Tail Pipes and GMC K15 Doors and Door Parts, or browse all GMC K15 parts and accessories.