assh0l3

http://www.mh-aerotools.de/airfoils/javapipe_en.htm

This is normaly for 2 stroke model airplanes, but if you put in all hte specs of your rngine it should just make a bigger template. Basically, you put in all your details including where you want the power band to be, and it will be able to pint out a template that you can cut out of steel and weld. I've never tried it but it dosent look like rocket science (this is from back in tha day whan I was into R/C airplanes)

Toysrme

Exactly what I was thinking. Beat me to it.
---- it, put one of those turbo's the size of a coke bottle on it.