I agree with Shalei. Like to add that after intensive search thru the web, I only found 2 makers for slip ons: Akrapovic and G&G. The latter I got is super light weight titanium and made in Italy & is half the price of former. The British companies sell them for a lot more. Get if from redracingparts.com for Euro 432.00 + shipping, only if your country allows non-road legal pipes. Mine does. And it sounds GGGRRReat !!!! Also, no re-tuning needed. Have fun! P.S. In enclosed garage, I have to start it away from my car - it makes the alarm go off :-)