Originally Posted by Palayah8ta
Is the HKS hiper the high pitched one used on a lot of 99-00 Si's? Ive been tryin to figure out what system that one was that i heard.. thnx
could be. it's similar in design to the Apex N1. that's more then likely what most of the EM1's are running.
it's definitely a lot louder then the SP2 or the EVO2, but it's supposed to flow better with it's straight through design. if you want quiet exhaust, this is not the one for you....