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Discussion Starter · #1 ·
would I benefit from a cat w/alarget diameter inlet/outlet
I have a dc 4-1 header and a RSR Ex-mag exhaust (97 Ls)

should I buy a larger diameter cat? ir should i go for a direct fit?

what are reputable retaliers online that carry carsound cats?

thanks for the help guys.
 

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What the outlet size on the header and what is the inlet on the exhaust. If yo have a 2.25 on the header you can go with the same on the inlet of the cat or you can go up to 2.50. Basically you would have a stepped design.
Like this...

Header (2.25outlet)--Cat (2.25inlet/2.50outlet)---Exhaust (2.50inlet)

This will not harm the motor as far as "choking" it from back pressure build-up
 
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