machz69, as you know, I have Jaws trail pipes. Unfortunately, my first set weren't a matched set, which caused me to jet unevenly and I wasn't able to do long wide open runs (thanks to my digitron egt reader). However, I was impressed with the power, snappyness (good throttle response), and the fact that they weren't jet sensitive (meaning I've jetted from 420 to 540 m.j. in -10 C with no burndowns , but only a performance change). I would recommend the Jaws trail pipes, but also to either get Greg at Jaws to do the motor work, or you to set your engine up to his specs, in order to be safe with his pipes (such as squish, compression, porting, base gaskets, reeds, airbox and carb venting). My buddy kennypope, has high mileage on his '99 FIII 800 (over 8000kms I think), which was ported by Jaws, has steel cage crank bearings, v-force reeds, gutted airbox with airbox carb venting, and the Jaws trail pipes, and is still running strong to this day. The only other pipes I would get for my Mach 1, would be the crankshops (which are now being made by Jaws).
That's my opinion and I'm sticking to it !