on my 4mm setup my rockets made 3 more ft lbs of torque than cpi. they also came on sooner and pulled harder. dyno sheet is on the rocket website.
like i stated above, on some setups they will outperform many pipes on the bottom. mine made more than cpi, and id be willing to bet on that same setup would make more than shearers. im not saying that cpi or shearers are bad pipes, because they arent. just that rockets will more than likely have more bottom end than either of them.
i believe it for sure. plus you get the top end...
www.eric-gorr.com he does a very nice woods port for 250 bucks. it seriously rips. with t5's, v force reeds and smaller domes my brothers old setup was insane for the trails. instant power that came on around 4000rpm peaking around 9000rpm. talk to jeff about his playport. i am not experienced with it but if jeff's doin it im sure itll rip. im guessing hell port it to make power down low as opposed to up high.