...Installed for my tomos targa lx. Not that much of a speed increase. It used to do 32 (top speed,on a long run). Now, it does 37. However, the acceleration is much, much better. It accelerates about 4 times as quick now.
LoL, the guy was an idiot. He was saying it would do an extra 8-12. I've never heard of a bi turbo adding that much, unless of course you added a shitload of teeth to the chain sprocket thing.
Anywayz, it cost me 95 for the bi turbo, and 45 to get it installed.