does anyone have gutted cats? or gutted precats? my budd with an S4 just gutted his precats(downpipes) and his gains are unbelievable. i know the G and the S are too different animals due to the turbo, etc, but id still like to know its effects on our G's.

G35S 6MT
Technosquare ECU
350Z Springs & Struts
6-wire ground kit

Just like you have a friend that did it, I've heard of people doing that all over the net. But I can't really recall any one doing it to a G or Z. I dunno, test pipe's can be had cheap.

I have the oem cat's off my car, I'll look at them for you tomarrow with a eye on gutting them. ( I'm of course running high flow cat's, but I'm keeping the oem cat's on purpose, just in case).

"All that's necessary for the forces of evil to win in the world is for enough good men to do nothing.”
Edmund Burke

G35 6mt

i see. and what exactly are test pipes? what part of the exhaust system does it replace?

G35S 6MT
Technosquare ECU
350Z Springs & Struts
6-wire ground kit

test pipes i guess are just straigt pipes that replace the cats entirely....big problem with those are they are loud and your exhaust will smell bad

2003 Black , sunroof, leather,
splashguards, 8 wire Hypergrounding kit, 350Z intake duct, K&N filter.

"....big problem with those are they are loud and your exhaust will smell bad" - and, of course, it can get real expensive if you're caught running them on the street.


2003 G35 Sedan - DP / Willow / AT / Premium / Sport
350Z Engine Cover, T-Stat & Air Duct / Stillen CAI
GG 7-Wire H-G Kit / TechnoSquare ECU / E-Fans
Street Edge TC / B&M Cooler / Stillen Exhaust

so i assume they wont pass smog then?
has anyone actually had them or seen them installed on a car? is it really that bad?
and is the sound thaat much louder?
and finally, how are the gains?

G35S 6MT
Technosquare ECU
350Z Springs & Struts
6-wire ground kit

My buddy has them. Yeah, they are loud and yeah you can smell gas in the car when you get on it.

I'm considering the Kinetix high flow cats--but test pipes aren't for me.

--Steve