Hi Harry,

First up, I would like to thank you for all the research you publish on your website. I always find myself referring back to your material when needing information on building an engine.

Secondly, I have a question about your Yamaha Big Bore 845. This is obviously an extremely attractive package for the weekend warrior that wants more power without the operation cost of 100+ octane. For this upgrade, listed under "Mandatory Accessory Modifications" you mention the FPP pipe. Is that the only pipe you use for this build? Would other pipes, like the protec (with 2" extension) work with this kit? I'm budgeting for winter builds, and trying to factor in exhaust as an additional expense. I’ve stashed away a Raider 62t/62t engine for this specific purpose…


Lastly, what’s average turn around time for this build? I understand it will depend on time of year, etc. If you have any estimations, that would be great.

I appreciate your time.


Thank you,
David