Hi
I'm also making an IC speed car. Here is a short video of the dynamic tuned pipe mechanism
Instead of fitting a 4 speed gearbox I have installed a dynamic pipe tuning system. This gives me max torque at 15,000 rpm at 330mm and max torque at 26,500 rpm at 285mm.
http://www.youtube.com/watch?v=-k1ZT...ature=youtu.be
I'll test it on the engine when I have the rest of the car together
Cheers