i have my stock cat with an apex ws catback...if i buy the jdm header, all i need is that converter flange they sell on those websites right...will i be okay...alotta ppl put another cat on...and by the way...can someone please explain to me how long i will be a trial user for...i tried to im moderators but im not allowed to do that either...i really wanna post some parts on the classifieds and i wanna ask ppl about stuff they are sellin there...if you guys could answer any of my questions it would be tight...thanks

 

2nd best solution: Get an aftermarket cat with a 2.5" inlet and a 2.25" outlet.

Best solution: Your exhaust only flows as much as its smallest point. Putting a 2.5" collector on a 2.25" exhaust system will kill your low end while providing no top end horsepower. Either get a 2.5" exhaust or match your exhaust by getting a header with a 2.25" collector.

 

the header's inside diameter is like 2.125...the outside diameter is 2.5...the inside diameter of my catback is 2.1875 and the outer is 2.36....this is what this dude told me in another forum...so i think it may be cool still...???cause my exhaust is bigger than the header???right??

 

by the way...can someone tell me how long i will be a trial user for???i am new to this site and have never seen a site like this...its pretty cool...and id like to sell my stuff here...thanks