With my testpipe, I noticed:
1. faster spool up
2. more power on mid-top end
3. lower EGT's
Bad thing is that it stinks, and i had once a scare when 2 cops in a bike was sitting right behind me on traffic, smelling all that crap
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Olympus Evolt E-510, E-520, E-30 x 2
11-22mm f/2.8-3.5 Zuiko Digital
14-54mm f/2.8-3.5 Zuiko Digital
35-100mm f/2 Zuiko Digital
50-200mm f/2.8-3.5 ED SWD Zuiko Digital
Cybersync wireless trigger
FL-36R, FL-50R, Metz-48, and Vivitar 285HV x 3