RE: (question) all about tuned pipes
If you want more bottom end punch a chambered pipe that's big in the middle with a large outlet will be best. If you want top end, a plain pipe kind of skinny with a smaller outlet diameter will be what you want. If it's just stupid torque you want, the Paris AL650 will deliver that and then some, but you will rob yourself of some top speed. It's also hard coated so it's much less prone to bending or denting than an uncoated pipe. Almost forgot, last time I checked on one of these, Ace Hardare Hobbies had them for around $40 or $50.