Hi All,
Here's my feedback on the Spec Clutch-
My application was a 97 Twin-Turbo. ("Was", since the car was recently sold. I guess I should post soon about what I got and how it compares to the NSX!)
My application therefore was the single-disc version. I can't remember if it was a "Stage 1" or "Stage 2" -- it was the one good for street driving (full face) that Spec said would hold 40% more power than the Exedy clutch. I ordered it with the lightened disc option. The flywheel was kept stock.
The first clutch I received worked well initially but quickly developed a strange wear issue, possibly relating to the throw out bearing or the fingers of the pressure plate not being properly hardened. No one was ever sure what the cause of the problem was, but I can tell you that Spec sent me a replacement unit free of charge. They stood behind their product.
The 2nd clutch was without issue and remains in the car.
The pedal actuation/feel is near-stock. You don't have to worry about a stiff clutch pedal. It feels great.
It also holds power well without being "overly grabby". You engage the clutch just like you would with the stock one, and you get the same sort of feel, it simply holds more power. That's exactly what I was looking for -- daily driver ease of use but the ability to get 426 rwhp to the ground
. The clutch performed great and I couldn't have been happier with it.
I only had the car back for a short period of time before it was sold, so I can't comment on longevity.
Given that up until now, the Comptech Powergrip was really the only choice for 97+ NSX's that needed more power-holding, the Spec clutch is a really welcome alternative. It's half the cost, could potentially wear longer (to be determined..), and it's more driveable (depending on who you talk to, the Comptech clutch has a firmer-than-stock pedal and may make more noise).
Hope this helps..
Marc