The HKS downpipe the big one is notably smaller than a full 3" I would stay away from it.

Sean

 

Agreed.

 

I have a tanabe dp, helix high flow and hks hiper exhaust....can't be happier with my current setup.

You can try Gruppe-s for any of those parts.

 

make sure not to taper down widen up and then taper down again... that's a recipe for disaster... power wise.

 

Sorry if this is OT or has been covered before, but is there a difference in these two catbacks - HKS Hiper and HKS Highpower. I think different vendors are calling the same item two different names, but I could be wrong. I know the 30th anniversary is the SS one.

 

trinydex,

I'm confused about this too.......all the tuners say this is bad and yet "Works" sell their 340 power package with a 3" DP and 3" catback mated to the stock cat (though they do have an optional 3" hi-flow cat for off-road use, but it's not a part of the standard power package).

 

http://www.gruppe-s.com/Evo/evoex.htm

I got my HKS exhaust at Gruppe-S. Pretty good guys there, they price match, and I have yet to have one bit of trouble buying anything from them.

And I went with the Helix downpipe since it was bigger than the HKS downpipe and almost $150 cheaper. No complaint on it yet.