old and good

iTrader: (3)

hi im wondering with the ls1 exhaust system. are there 2 or are there 3 cats on the exhaust system? cus i just looked under my car and noticed that i have only 2 cats. the reason im asking is just cus i have a home made exhaust system that was that way when i bought the car and im wondering if the big 3rd cat has been removed

Shallow Bay

iTrader: (3)

A stock exhaust system will only have two cats.

old and good

iTrader: (3)

ahh i see. i thought these cars were like the japanese V engined cars with two precats and 1 big main cat. well i thought the "precats" were a bit big hello LT and ORY.

on that subject, what is the difrerance beetween a of road y pipe and a non of road y-pipe

RrCoX22

iTrader: (6)

oh boy... and ORY is a Y-Pipe w/o cats... hence Off Road Y

non ORY is obviously a catted y

DomesticLS1

I want to go ory but how do you pass the emmissions test. Down were I live(fort Worth) they put a sniffer in the exhaust

RrCoX22

iTrader: (6)

will mostly definitely fail the visual too. you need cats to pass the visual.

old and good

iTrader: (3)

does anyone know ~ how much CO2 % a stock no cat car wuld make? as mine is doing 0.28% now but the legal limit in iceland is 2%