Thank you for all your recommendations.
There are some distinct advantages to consider with our billet twin carbon clutch:
1. Factory hydraulics - the billet twin carbon clutch uses factory hydraulics (master and slave cylinder), no need for reversing hydraulics to convert the Honda pull design to a push type. This reduces cost, decreases complexity, and allows the seal on the transmission to remain.
2. real carbon-carbon design - of the carbon clutches you list, the billet twin carbon is the only one that meshes carbon-carbon friction liners with carbon-carbon liners instead of carbon-carbon against steel. Meshing carbon-carbon is the proper, although more expensive, way of building a carbon clutch - this is why top end racing clutch manufactures like Tilton and AP Racing, with clutches that start at $4000, use this design. Meshing carbon-carbon against steel warps the steel which causes very high shudder and decreased life from the warped steel surfaces "scraping" at the carbon. In addition, this design allows you to take advantage of carbon-carbon's properties of having high static friction and relatively lower kinetic friction (meaning the clutch is easier to engage).
3. Decreased noise - all of the clutches listed make noise when you depress and hold down the clutch pedal because they are all a floating type. The disc plates "bang" against the cages that hold them in place. Our design uses aluminum posts that are hard anodized. This reduces the volume of the noise heard to the point that it is almost inaudible and reduces overall weight.
4. Torque capacity - the billet twin carbon has the highest capacity of the clutches listed (thanks to the carbon-carbon design).
5. Drivability - In addition to the billet twin carbon clutch, I have owned or driven the Exedy, OS Giken, and Carbonetics clutch. The billet twin carbon clutch is by far the easiest to drive in both clutch pedal pressure and engagement.
6. Price - despite what I feel is the superior product, the billet twin carbon clutch is the least expensive of the options listed.
more info:
http://www.scienceofspeed.com/produ...oducts/NSX/ScienceofSpeed/billet_twin_carbon/
I hope this helps, feel free to contact us if you have any questions!
take care,
-- Chris