SCOOTER, most states have EMISSIONS INSPECTIONS, and without the CAT, they aren't approved for the road... that's y i don't touch'm.... the RT has a HUGE 'cat' underneat, very visiable to the eye... if you remove it, they'd know immediately... however, on the RS, you can't see the 'cat' because it's inside of the muffler... they'd never know if you removed it, except your emissions may prove to be too high, and you'd fail the emissions test...
Dan P