POST 1Original post
I have a 997s 2007 and want to fit hi flow cats. Are 100 cell or 200 cell better in terms of hp gains. I am already running BMC air filter , IPD plenum , X-51 headers and softtronic. Anyfeed back / help would be great.
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YOUR RESEARCHcats 100 or 200 cell ?
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POST 2Original post
In terms of exhaust flow/restriction, the fewer CPI on the cat to going catless provides the biggest gains. In many cases the 100cpi cats will throw codes, but you have a flash so it's probably going to be fine. If it does have softronic provide a fix for it. Ed
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