If you remove just the rear cats is there any issue with cel or car running to rich,how much louder is the car? how about if the silencer before the mufflers is removed as well. any better throttle response?
I doubting there is much hp to be obtained from adding a complete new larger exh,so maybe just modifying the stock one will make it sound a little better and respond a little quicker?

 

does anyone even know what the stock exh sounds like without the resonator silencer removed?

 

Im wondering the samething, although if you go on youtube type in GS350 TRD. That video should help determine some thoughts you may have...

 

possibly as little,but im sure there is a large diff in the way the lexus v6 and v8 sound with a sim exh

 

I wouldn't have them modify your existing exhaust like that because you will not be able to return to stock. If you search the forum you will see how mine was done, and since I saved all of the original parts, for $100 I can put it back to original form like most Lexus buyers want.

 

couldn't agree more

 

kev...good thread and nice idea,Ill link that to this one,,much better info there for future searches

https://www.clublexus.com/forums/gs-...st-system.html

 

you can always go with straight pipes

https://www.youtube.com/watch?v=OZBH...&feature=g-upl

https://www.youtube.com/watch?v=WVfB...&feature=g-upl

 

did yall notice any better throttle response with these mods?

 

Nah it just turns it into a manlier car

I did have the throttle controller and that was fun to play with Can't say the car was "faster" but the response and settings sure where fun

 

0-60 no. 60-120 absolutely. But, most importantly, it sounds 100x better doing zero to anything. Even on my 911, the first thing i do when i get into the car is flip on the sport exhaust. Porsche always defaults it to off, which is a bit annoying. With my GS it's always on!!!

 

interesting you feel the top end is much better