High Performance Exhaust Systems. There's really only one problem with the exhaust note of the first-generation XK8: It basically doesn't have one. We offer several options to correct this deficiency. All of our exhaust systems are made in England from type 304 stainless steel. All pipes are bright polished. Mufflers are bright annealed. Option Two. Want to let your XK8 really breathe? Replace the intermediate mufflers and restrictive over-axle pipes with mandrel-bent stainless steel pipes. Must be used in conjunction with 17-0359 above and connect to the original or "Option Three" center muffler.