i heard them both tonight while remapping my bike and to be honest they both sounded NICE. i couldnt belive how diff the M4 sounded on laurie's 600 compared to our 750s. wicked is a good word for it
the R55 sounds good too, however i would have liked to hear it down the back straight at summit while doing 14k
you kids have fun tomorrow and be safe out there. wish i could join you but work is kicking my ass!
__________________

2007 GSXR750 M4, Powercommander, Vortex, Woodcraft, MotoRX... more to come