What Actually Sounds Best on GMT800s
After years of builds and community consensus, the setups that consistently sound right:
Deep + aggressive (most popular)
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Flowmaster Super 44 / Super 10
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True duals with X-pipe
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Mild resonator delete
Clean performance tone (no drone)
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Borla S-Type or ATAK
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Magnaflow straight-through muffler
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Stock cats retained
Old-school hot-rod sound
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Long tubes → X-pipe → chambered mufflers
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Side exit or rear dump
Community feedback consistently puts Borla, Magnaflow, and Flowmaster at the top depending on whether you want refined tone or raw aggression.
What Makes a GMT800 Sound GOOD (not trash)
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Keep pipe diameter reasonable (2.5–3")
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X-pipe smooths the LS firing tone
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Too much delete = raspy pickup sound
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Muffler choice matters more than brand hype
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Tailpipe length changes tone more than most expect
The Sweet Spot Setup (Most People End Up Here)
Long term “best sounding” combo most owners settle on:
Headers (optional)
→ Stock cats or high-flow cats
→ X-pipe
→ Magnaflow or Super 44
→ Exit behind rear wheel or bumper
Deep idle. Hard cold start. No highway drone.