some guys mount the pressure fitting on the header, i mount mine right before the apex of the tuned pipe. There are two basic types of pipes you can go with... muffled(good all around performance, and pleasant sounding), and the Unmuffled pipes, AKA "nitro pipes" they are designed for top end(rpm), you'll hardly have any midrange, and they are loud.... if all you wanted was speed go with a nitro pipe, if you were going to be flying pattern or aerobatics got with a traditional muffled tuned pipe



*edit you ought to pos this in the glow engine section youll get a lot more responses