Does anyone know if you can find downpipes for the GS4? I've been looking online but I haven't been able to find anything.

 

An oem one? Or aftermarket?

 

No one makes them, because that's where the cats are located.

 

If he specified replacing the cat, I would have said thats where the cat goes.

I'm going to go out on a limb and assume he wants an aftermarket downpipe, which IF you found one. Would probably be just north of a million dollars like everything else aftermarket on these cars lol.

 

GS400s its just..

Header > Cat > catback.

 

I'm going to assume that the only thing u can put on the GS4 is a catback exhaust, PPE headers, and a custom y-pipe before the cat.

 

^^ as far as the exhaust goes

 

I've seen a downpipe for the 98-03 GS3 but I don't know if that will fit for the GS4

 

dont think you can put a custon y pipe before the cat because the cat is right after the headers.

 

Does anyone know when SRT will come out wit the GS4 supercharger kit??

 

From front to back it COULD go like this:

PPE headers, CUSTOM SS hi-flow cats w or w/o o2 bungs, custom y-pipe w/post cat o2 bungs, THEN "cat back" exhaust of your choice. Depending on how legal you wanted to be.

Oh, how I wish Carson still sold their "true" catback exhaust!!!

 

its not really when.. they have everything for it. its just a matter if the person really wants to fork out the $$.

but yea they already have it and some of us already have the RMM superchargers.

boils down to if you have the $$ to spend on one.

 

As far as modding a gs4 goes? I will ONLY use parts I've made, including stainless exhaust etc. Saving for a tig welder as we speak