going forced induction

[Reaper]

Originally Posted by Noob4Life

I ran a small KO3s on my GLI and ran a full 3" exhaust. You can run a 2.5" on a small turbo just fine but a lot of people will choose just to run a straight 3" in case they ever decide to upgrade, you want as little back pressure as possible after the turbo anyways so it doesn't do any harm to run that big. If you already have a 2.5" exhaust you can use it on your turbo build.

I just checked and full blowns kit comes with a 3" dp so you'd need to make a reducer to run it with a 2.5" system and it wont be as free flowing.

I realize this is old but;

the 3 inch DP has a 2.5 flange on the overpipe side as do all turbos that bolt to a factory overpipe, or one that will work with a factory exhaust. Unless you request it everything will have a 2.5 flange regardless of pipe diameter. So your 3 inch DP and your 3 inch manifold back exhaust will have a 2.5 flange in it somewhere unless its been specifically ordered that way. Its all or nothing since a 3 inch flange will not fit anypart of the factory exhaust and people like to mix and match.