13bpower

This is probably obvious to those who know the answer, but I dont want to gut my precats if I need them to pass emissions. So, the question is will my 87 T2 pass emissions with just the main cat? I assume it would, but that brings me to wonder, what was the point of the precats? I know alot of you have tried this so let me know!

Ryde _Or_Die

Well every car will be different. It depends on the condition of the main cat as well as how rich/lean you are running. I believe alot of FCs fail emmissions even with the precats, so I wouldn't assume you will pass.

live4boost

iTrader: (2)

I passed with just the main cat on who different TIIs. One had a DP, and the other had a guttted precat.

ViperKillerWannabe

The precat is only for reduced emissions during warmup. As long as you take it there really hot, you shouldn't have a problem.

MURX

yeah, make sure you warm that sucker up good before you get tested.

Turbonut

iTrader: (1)

Passed Jersey emissions with flying colors. Bonez DP and Bonez hi flow cat. Air pump operating a must.

13bpower

Thanks for the info guys. I looked under my car yesterday and saw how freakin' huge the precats are. Those things must wiegh a ton! Makes me wonder if it is worth the extra money right now to buy a downpipe instead of gutting the precats. Would say alot of wieght! Hummmm.... Think I'll decide that when I get that sucker off and can wiegh it.

NZConvertible

Not really but a DP will flow much better than a gutter precat. Worth the money as long as boost creep isn't going to be a problem.