Our stainless steel exhaust systems offer excellent quality and value. Critical bends are mandrel bent, so the bore diameter stays constant and doesnt form power-robbing reductions at the point of each bend. Mufflers are constructed to original designs, but the internals employ modern materials and manufacturing methods. Stainless exhaust systems make perfect sense for classic and soon-to-be-classic Jaguars as they are an install-and-forget item. Highly recommended. Lifetime corrosion warranty to the original buyer. The XKs Unlimited Advantage: To aid in installation we recommend the purchase of the mounting kits. Using new mounting parts and clamps will make an otherwise difficult task a little easier. Note: Exhaust systems are not supplied with mounts, clamps or seals. The ÒsingleÓ type system routes through a hole in the frame as per original; the ÒdualÓ system passes under the frame as per original.