I just picked up a YS 45FR with header and mac pipe (think it's a 7.5 pipe muffled). What is a good starting point from glow head to max diameter? I will most likely be using 15% nitro, prop not sure maybe 9.5-6, 9-7. It's going in a laser arrow which I had been flying with a webra 50.

Thanks, Chris

Hi,
You can go here,
http://www.jettengineering.com/

Look at "tech specs and istructions" they have for tuning a fullenght tuned pipe. Good luck, Amir