I have a question what sizes does the HKS Hi power exaust come in?. To my understanding its 60mm and 70mm right?. another question is, is 60mm the equivilent to 2.5" and 70mm the equivilent to 3"?. if so what do u guys thing about a single HKS Hi power 70mm (3") with 2.5 custom piping to the cat? gains? or should I just get the piping 3" aswell to the cat? which will give better gain?

Or should i just get the T1R sparrow dual exhaust?

BTW. I have an ap2

 

The HKS system is 60mm and where it splits, drops to 50mm. 60mm is 2.362" and 70mm is 2.756". Conversion factor is XXmm times .03937008 in/mm equals your inches.

Are you talking about mufflers with custom piping?

 

yah..because HKS offers just the canisters. and i was gonna get a single custom piping all the way to the cat

 

sell the hks and get a single!