OS 50 on 30%

[jakesvdm]

I have an OS 50 (not the Hyper). I just want to know if I would see a performance increase if I use 30% nitro as aposed to 15% ? I know that I wuld probably have to shim the head ?

I have the TT mufler - PV0109. We also live 1500 meters (about 4900 feet) above sea level.

[Pinecone]

Yes. And at 1500 meters, you might not need to add shims.