Designed to fit OE and DEP front pipes. The silencers are manufactured with a polished aluminium outer canister and amild steel internal perforated core, surrounded with a high temperature Eglass packing. All silencers have been designed as a performance enhancing product for optimum power increase, we advise this to be used with a DEP front pipe. Our silencers are easily repackable.made in England Silencer DEP Does fit USA version 01-08