I have found a supplier in Perth that can Supply me a HKS Hi-Power Exhaust.
These seem like a good alternative to a stock as its a relatively low drone exhaust, if any at all. And they sound great.
Not many people can get exhausts for S2000's here so there aren't many options unless I import one in myself

Anyway.
I have been doing a bit of reading on these and from S2KI forums, I hear that the HKS actually loses power over the stock exhaust?
Has anyone had any experiences with this particular exhaust and can anyone confirm that this is the case?
It seems hard to believe that a HKS exhaust will actually cause you to lose power over a stock one

I really don't want to waste my money on an exhaust if it's going to give me less power than a stock one. I'd be pretty pissed if that was the case :P

Any information/advice would be great. Thanks.