I bought the whole Aaen package
- 42mm Carb
- Megaphone exhaust
- Roller clutch kit
( Front Clutch - Aaen Red spring and 55 gram weights )
( Rear Clutch 38/42 cam and Aaen Blue spring )
- Hiperformance Belt

It was probably around $700 or so with the shipping and tax. Once properly tuned the bike beat a stock 500 in a 100 ft drag by about 3 to 5 bike lengths. Clutch tuning is important and climate is a factor. I can't say it is as reliable as stock because but it starts up like a champ. I keep the bike outside and I have had a dead battery for months now but 2 or 3 pulls is all it takes even on the crappiest of days.

Chris Picciotto
99 Scrambler 500