I think the Kyle full ti system is as strong if not stronger at the top end than just about any of the others, he has a few dyno curves for comparison with the Akro long and short systems. When I was looking for a system I talked to a lot of dyno operators, and it kept coming back to the fact that the shorter systems were LOUD. OK, so is a long system without the dB killer that much quieter? Apparently yes, as nobody has been accused of a too loud exhaust, even without the dB killer on a long system either on the street or the track in our locality. Short systems even with the killer in are upsetting the authorities. This makes sense, as the length and the ID of the intermediate pipe makes for a much larger volume in front of the muffler, and the muffler itself is much larger. So you can have your midrange power (greater length, better reversion at lower revs) and not be too loud. I would have loved a short Arrow system, but everyone said it was loud, lucky for me I went for a long system, and afterwards heard the short system, boy was I glad I chose the longer (quieter) system. YMMV of course, none of these will work very well without a PCV and a good map.