RAD ROLLA Posted June 23, 2009 Report Share Posted June 23, 2009 hey just wondering what would be the best sized exhaust on a stock 4kc should i go under diff or over? and are a 38/38 webbers too big for a 4kc? thanks Quote Link to comment Share on other sites More sharing options...
Felix Posted June 23, 2009 Report Share Posted June 23, 2009 hey just wondering what would be the best sized exhaust on a stock 4kc should i go under diff or over? 3" straight through and are a 38/38 webbers too big for a 4kc? anything smaller than a 750 holley is for pussies Nah, just pulling your leg :) :) FAQ here and use the search function HERE I probably could have spoon fed you in the time it took me to add those links, but I think it is in your best interest to do some research yourself. Quote Link to comment Share on other sites More sharing options...
Falken_KE30 Posted June 23, 2009 Report Share Posted June 23, 2009 3" straight through anything smaller than a 750 holley is for pussies Nah, just pulling your leg :) :) FAQ here and use the search function HERE I probably could have spoon fed you in the time it took me to add those links, but I think it is in your best interest to do some research yourself. i thought 4" mandrel was the minimum for maximum power? Quote Link to comment Share on other sites More sharing options...
Taz_Rx Posted June 24, 2009 Report Share Posted June 24, 2009 i thought 4" mandrel was the minimum for maximum power? Only if you feed you 4k with TWIN 750 double pumpers, then 4" might be a bit small. :) Quote Link to comment Share on other sites More sharing options...
Palmy Posted June 24, 2009 Report Share Posted June 24, 2009 i would have thought with a stock 4k, after reading the faq. i have been thinkin for my car a 1.75" to 2" pipe over the diff. Quote Link to comment Share on other sites More sharing options...
kiahn Posted June 24, 2009 Report Share Posted June 24, 2009 hey if you've read the faq but still can't decide: ive got a stock 4K-s with a 2 inch press bent system so the min is around 1.8" it is pretty good if you put a pod filter on the way i did(cheap yet effective), it gives a tad more power and allows for a bit of modification without being over kill for a stocko oh and if your planning on lowering your car go over diff so as to not scrape on every speedbump hope that helps Quote Link to comment Share on other sites More sharing options...
philbey Posted June 25, 2009 Report Share Posted June 25, 2009 With most corollas you shouldn't have any real trouble going over the diff/axle, there's ample room. Although if you're on the bump stops.... Quote Link to comment Share on other sites More sharing options...
nichy Posted June 25, 2009 Report Share Posted June 25, 2009 QUOTE-With most corollas you shouldn't have any real trouble going over the diff/axle, there's ample room. Although if you're on the bump stops.... haha bump stops... allways a problem.. when you have them Quote Link to comment Share on other sites More sharing options...
rob83ke70 Posted June 25, 2009 Report Share Posted June 25, 2009 i would have thought with a stock 4k, after reading the faq. i have been thinkin for my car a 1.75" to 2" pipe over the diff. better for flow if you go the other way around. do some reading about exhausts on wrx's in particular the mrt exhausts. As the gas travels further from the engine it cools down thus losing energy, and slowing down, if you step the pipe down in size slightly as it gets further away the gas speed stays really fast, thus you get good scavenging. Doesn't give you any street cred though if you have a small exhaust pipe coming out the rear of the car. Being pedantic I know. Robert. Quote Link to comment Share on other sites More sharing options...
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