im looking for some info on what pipe would be the best choice for a .70- its not going in a plane,but i cant seem to get any acccurate info on what to look for in a pipe. ive been told to just use any pipe,but i cant see the differece between most of the pipes for trucks, and the engine has a lower operating rpm than most. i figure you guys would have good info, so could sombody help me out?