Xforce 3" Cat-Back System, 409 Raw Stainless SteelXforce 3" Cat Back System, 409 Raw Stainless Steel Scarico Cat Back in acciaio inox 304. Getting the best sound performance out of your Mazda RX8 Series 1 couldnt be easier with the XFORCE 304 grade stainless steel cat back exhaust system. \n\nUsing a 3 bore system throughout for maximum performance, our engineering team ensured that only the exhaust sound you desire is transmitted into the cabin, thanks to the inclusion of an anti drone canister.