180ls1

iTrader: (4)

i have an 1999 ls1 camaro and the exhaust is pretty bad i was wondering if i should get a cutout before the cat under the passenger seat? It allready has the simulators for the back o2 censors ready to be hooked up. Would i loose too much back pressure and actually loose power or should i just buy a new exhaust kit and eliminate the second cat?

staringback05

iTrader: (8)

im not exactly sure why you would do that....have major restriction on one side of the car and none on the other....just get an aftermarket exhaust

hawaiianpunch01SS

i dont know if you would loose power or not or if it would be enough back pressure. i am thinking it would be fine. i know it can be done and has been done lots of times as long as u have the o2 sims or tune it out, otherwise the light will come on

staringback05

iTrader: (8)

wait.....your talking about putting it in front of the front o2 sensor or no?

180ls1

iTrader: (4)

yes before the second o2 and before the cat under the passanger seat. the simulators are allready to go

98Z28MASS

iTrader: (6)

Only one cutout makes no sense if your doing it prior to the I-pipe (in the y-pipe). Just have it welded into the I-pipe and if you have 02 sims gut your stock cats too.

180ls1

iTrader: (4)

O sorry guys for the confusion i thaught the exhaust was different i looked at it wrong. How much will gutted cats give me like 5-10 horsepower? And will the cut out give me more horsepower than a flowmaster muffler?

burnrubr88

iTrader: (2)

yes. flowmaster would be the worst thing you could do.

Havok2

iTrader: (118)

after cat, just go with the grain

Intense

iTrader: (8)

Straight pipe it... dude its awesome lol. But put the cut out on the I-Pipe... then you have nothing to worry about...

staringback05

iTrader: (8)

gut your cats and throw a cutout on the I pipe