I just fitted the X-Force 4Inch stainless dump into 3.5Inch Stainless Cat into Y for Mild Steel Twin 2.5Inch Exhaust (All X-Force), I bolted it up myself and it all went in easy and sounds unreal, would highly reccomend this for any XR6 T. Was running 285rwk befor exhaust now running 320rwkw with new tune and the x-force exhaust. Supporting Mods include: Performance valve springs, aftermarket front mount, knN panel filter, 60lb injectors. Goes hard now!!!!