Okay so Iam lookin to maybe go supercharged but i dont have a set decision yet so I figure I throw some rims on instead of steelies and maybe throw a downpipe on considering that it willl be used in the future no matter what route I go. I figure I do a mod that I can dot hat doesnt requrie a tune. will I feel any gains with a better downpipe(still stock header)? Also can I go 3 inch on the top where it exits 2.5 ( meaning will the 3inch be compatible with my stock header.) and last question is i only need the one bung for the 02 sensor right? thnx

 

no not really might sound a bit different, as depending on your charger you may still on need a 2.5 in Dp, and im running catless