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 One: This kit replaces the rear-most mufflers with straight pipes and handsome resonator tips. It will give your XK8 the exhaust note it should have had from the factory. Purchase the correct mounting brackets separately.