If any of you are thinking about modifying your exhaust read this real quick. Just to let you know, rear section are of course mufflers, before that are 2 resonators shaped like large cigars. Before that on SOME cars(not california equipped) is a Resonator shaped like a very small muffler. If your car has something with what looks like lines cut perpendicularly in it. OR if your car is california equipped then this piece at the Y junction after the rear O2 sensors IS A CATALYTIC CONVERTOR!! I recently spoke to Hameed about his custom exhaust and on his car he has a resonator there, i wanted to do an exhaust like his but since mine is cali equipped then that is a cat which cannot be removed legally. just a heads up for you guys thinking about modding your exhausts.

 

actually I just had my custom exhaust done a couple months ago, and my exhuast guy informed me that the middle portion was a resonator, and my car is cali originally registered.

on the other hand, i have heard this mentioned before. for reference fact, my car is a 98 GS400. maybe the year might make a difference.

 

My 2004 GS430 definitely 'had' a catalytic convertor just before the resonators. It was a PITA to get someone to do my custom mid-pipe/x-pipe job, but I finally got it done. Oh ya, we don't get checked in Florida.

 

Is there a big performance difference with the cats off? I haven't seen dyno numbers, but I think it's not that great.

 

i doubt the performance is all that great. GS42, the year does make a difference i believe this was only on 99+ or 00+ im not sure what year it was but it is definitely a cat. its not a monitored cat so removing it wont throw a CEL, but you could potentially fail the visual inspection if the guy doing the smog test knows his shyt.

 

The year matters - (early) GS400s it's a resonator.

 

My 98 GS400 Cali car had a cat there. Note I said had

Jonny

 

GS430 has a cat in that location. That is how it became the first LEV certified V8. That is also why we lost e-shift on the GS430s. Basicaly, If it is rounded and looks like a cat, it is. If it just looks like a small muffler, its a resonator.
-Will
Btw, just had my custom X pipe done a week ago. Sound clips and video to come. Hope you guys can come to EOS v5.