Which exhaust do I have ?

[Okeyd57]

I have an 06 STi with a catback exhaust. If I put a downpipe on it, would it be a turbo-back system, or would it still be a catback system because of the cat on the mid-pipe ?

Is a catback system quieter than a turboback system ? Thanks, Okey

[LiL Shoaf]

Typically a Down Tube will run to the location of the Cat back which would give you a TBE..

As for the noise, it's going to be a little louder and an little beeper with out the cats. GO FOR IT>.

[WRX_JUNKI]

Becoming catless will make you slightly louder but definitely worth it. Most aftermarket downpipes cover both of the cats so you do not need to worry. You can have the Helix catless downpipe from Gruppe-S for $229 shipped.

[NeLo]

so if you were to remove your cats for perforamcne puposes, but you don't want to be thatt loud, could you still install resonators or something withtou hurting performance?

[9d2TSi]

Originally Posted by NeLo

so if you were to remove your cats for perforamcne puposes, but you don't want to be thatt loud, could you still install resonators or something withtou hurting performance?

Buy an exhaust that comes with a silencer if you're worried about volume. That, or buy the Borla Hush, it's pretty quiet.

[LiL Shoaf]

The Greddy EVOII is also a quiet Cat Back system.