Ok so,

I have a stock 1991 rx7.
Would it drastically increase my emissions levels if i were to eliminate my catalitic converter with a cat-replacement pipe?
I mean to a level which I would not be able to pass the emissions test.
My car already passes with flying colors as is, I'd just like to know cause I'd really like to swap out all my exhaust with something more free-flowing.

Thanks,
Tom B

 

the simple answer is yes. You will not pass emissions without a catalytic converter on these cars.

 

thanks, any idea if I will still pass with a replacement, hi-flow cat?

 

you wont pass.
just get a test pipe and KEEP your cat and precats.
that way you can bolt them on when its emissions time.

 

thanks, sounds like a plan

 

i had a brand new bonnz hi flow cat put on to pass emissions. went and tested it and was almost tripple the passsing limit in all four catagories. btw this is on a 85 carb'd 12a, just a little different from your situation.

 

Triple as in you passed with X3 flying colors? or failed miserably?