GHL's MkV GTI Exhaust is a stainless steel, 3.0" mandrel bent, turbo-back exhaust. Unlike most other aftermarket exhausts, the GHL exhaust is a full exhaust from the turbocharger back. The GHL downpipe features a resonator and delete pipe and high-flow catalyst same one GHL uses on their patented non turbo Porsche cat headers. TIG welding, fully stainless construction,you will not find a higher quality system on the market. All GHL exhausts come with a full lifetime warranty, and all are fully polished with dual 3.0" round rolled tips .