What to look for when choosing a new clutch:        

1. Price - High price does not mean high performance.  It probably means high production costs as a result of low volume.  If the manufacturer has modern equipment and high sales volume, the outlay for a high performance two disc clutch is about $250. 
2. Price Part Two - The raw materials and expertise necessary to build a good friction disc are expensive.  A pair of low quality discs saves about $40 but gives away loads of performance and durability. 
3. Manufacturer's Focus - Does the manufacturer make only clutches?  If it also builds engines, chassis, bodywork etc., can it possibly design and build the fastest clutch? No.  Friction engineering is far too complex for part-time players.
4. Ease of Maintenance - You must disassemble and check the clutch every race if you want to be fast every race!  Your competitors are doing it.  Now, does is take five minutes or 30 minutes?  Does it require special tools or knowledge?  Can you do it yourself or do you need a clutch guru?  Can it be accomplished at the race track or only back at the factory?
5. Total Clutch Weight - Not very important for acceleration when you have a nine pound flywheel!  On the contrary, heavier clutches can withstand far more heat than lightweight clutches and easily go the full distance. 
6. Friction Material - Choose a manufacturer with extensive experience and solid technical knowledge because friction characteristics are the most critical part of a racing clutch.  There are thousands of friction materials available. Very few are race worthy.
7. Lever Mass, Length and Position - The geometry of the lever is critical.  Look for six or more long and heavy levers located radially distant from the crankshaft centerline.
8. Spring Geometry - Short, stiff springs are very sensitive to air gap, preload and temperature.  Long, soft springs are a better choice.  They are user friendly in the pits and less troublesome on the track. 
9. Plate Design and Quality - How are the plates (floaters, pressure plate, back plate) manufactured?   Performance is affected by parallelism, flatness and residual stresses.  If the plates are ground on only one side or ground one side at a time there will be problems.  Look for plates that are double-disc ground.
10. Drum Material - Steel is stronger but aluminum is better because it dissipates heat five times faster.  Overheated clutch discs lose their grip and reduce acceleration big time.