AN old ? I know
how much will my egts drop by doing a cat delete pipe (off road use only)? and how much drone will i have? I have a Rokktec silent might muffler. Is an aftermart 4 in exhaust better than the stock one?
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No much if any change from deleting the cat. A 4" straight through muffler is better than the OEM version. But don't expect big gains from changing it out.
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Your stock turbo is gonna build more heat than the muffler.
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