[SamM]

FastDoc,
I'm looking at the MegaBomb rather than the PowerBomb. There's about a $50 difference between them. The MegaBomb header is advertised to give a 1.5 dB decrease in sound. The PowerBomb add does not list a decrease in sound.

My thoughts on going with the bigger 351cc bore are that I would probably need a bigger custom pipe and muffler. The FMF MegaBomb is still sized for the 250cc bore. It's more than likely going to be the bottleneck with the 351cc big bore cylinder. There is not a big increase on power when going to the bigger bore over just a pipe and muffler. From 26 to 29.8hp isn't much. The FMF exhaust system would probably be a good match for the 300cc engine kit. That's my reasoning for starting with the smaller bore first. We'll have to see! I'd like to dyno the bike with just the exhaust mods first, then with the headwork and cams. Once I see how this effects mileage, I would go forward.

I just don't want to have the bike down for any length of time.

SamM