► Aprilia RS4 125 W/ AUSTIN RACING EXHAUST- ACCELERATIONS, REVS,START-UPS!!

► Here is a video of an Aprilia Rs4 125 with an Austin Racing exhaust system. In the video, you can see the difference in noise levels when the db killer is on and off. This exhaust is basically like straight pipes. The downshifts are very nice and personally I think the Aprilia is the best looking in its class!