Originally posted by JWN
As long as you can find one for sale from someone you trust ran it properly, I agree.
John
The Webra 145's were ran by the entire German team at the Worlds, I think they are more than capable.
The OS FI not not any more powerful than the RX, in some cases people have reported losing a little power. Neither will be any more powerful than the Webra, or the OS 160 for that matter.
As far as pipes and header, well you can drop nearly the same on a 4-stroke exhaust as a 2 stroke one, so its only the price of the motors that really makes a difference.
Myself I run a 140DZ, but there is no need to do that.