Wondering if anyone could help me out here
what kind of HP gain can the s2k get from the:

HKS Hiper Exhaust
and
Header (none specifically)?

 

I have never seen any dyno charts of the HKS vs stock that indicate power change either way.

Likewise, I don't think anyone has supplied a dyno plot which verifies HP gain by addition of aftermarket header ONLY. (Exclusive comparison.) I expect there is some HP gain to be had with a Mugen header, for instance, but no reliable data exists... at least, none that I've seen.

Hey Mods, to Under the Hood with this one...

 

The Mugen header shows a power gain in various parts of the curve (2k

 

there is a dyno chart for the hks exhaust on rmracing.com they have a peak of +7 hp and about 3 ft/lbs to the ground.
jeremiah silver/red #008484

 

The only one I see there is the one for the RM exhaust, not HKS. We normally just compare member dyno results since the vendor results can sometimes be optimistic.

 

I have a friend who works for HKS USA. He said when they dyno tested the exhaust, header, etc. nothing made more than 2 or 3 hp if even that.

 

The sound alone is very nice. Not sure I like the
looks of the HKS (yes, i do have one on my S2000 though)

I think the Nuespeed version with those silly stop-sign
looking tips knocked off looks good!

HKS is fairly expensive for a mostly steel,
very heavy system. Sounds very very mellow and nice though

Scot