cat question

[E30_fiend]

I have a question about a new catalytic converter for my '90 IS. I want to get rid of my stock cat and center muffler combo but i dont know exactly how to go about doing it. Should i try to find a cat with a dual in dual out design (if there even is one) or how should i do this. What I would like to do is get the new cat and just pipe it back to my muffler.
also my muffler right now is a single inlet so when I installed it we had to make a "Y" pipe in order for it to fit. So another question would be, could I by chance buy a cat with a dual inlet and single outlet and run new 2.25-2.5" piping back to the single inlet muffler?

any solutions or suggestions would help

thanks
E30Fiend

[JasonC]

I get alot of my stuff though Summit. Here is a link to some of their cats.

http://store.summitracing.com/egnsearch.asp?N=700+4294923429+4294867633+4294891681+115+4294903588

[E30_fiend]

cool thanks but i have one question for you.
can i get a dual inlet single outlet catso i can delete the Y-pipe in the back before the muffler?

thanks
E30Fiend

[JasonC]

Yeah, here's one here in the size that you are looking for http://store.summitracing.com/partde...5&autoview=sku but i don't know how much money you are looking to spend.

[E30_fiend]

a 2.25" inlet isnt too big for my stock IS exhaust downpipe? where it meets the stock cat?

[JasonC]

a 2.25" inlet isnt too big for my stock IS exhaust downpipe? where it meets the stock cat?

Souldn't be. But i don't know what the stock size pipe is on a "i". I got full 2.25" on my e so i think a i could handle it.

[E30_fiend]

yeah but the I's and IS's have dual piping from the exhaust manifolds through the cat and center muffler and to the stock muffler. i dont know the exact size of the stock exaust but i dont think its any bigger than 2"