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The biggest gain would be gutting/removing the cat. Followed by a 3" (or 4" if you're brave) down pipe. A good air filter (not K&N) is also beneficial. You should look into the 6637 mod or the filter in my signature. (I think I'm the only one here that uses it.)
Been looking around for turboback kits. (Don't want to run a 4 or 5" straightpipe from a 3" down pipe on the turbo. Figure that defeats the purpose.)
Anyways I found this diamond eye 5" turboback kit. Anyone ever run one?
I'm strictly looking for power and performance from this. Granted I love the sound of the turbo whistling but I don't want it to be flat out obnoxious.
A 3" downpipe into a 4" or 5" exhaust will not "defeat the purpose." That is just a common misconception. A 3" downpipe is probably good to 450 - 500 HP. Plus anything larger than a 3" is a major PITA! A 3" is hard enough. If you read the description for the kit you posted in that link, it says it comes with a 3" downpipe.
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