The CTS Turbo MK6 Golf R 3" cat-back exhaust system is hand tig welded using the finest T304 stainless steel. Our exhaust system was designed for both street use and big turbo abuse. Other MK6 R20 2.0T exhausts that are currently available can choke peak power and limit the breathing due to their 2.5"/2.75" construction. The 3" design of the CTS Turbo MK6 Golf R cat-back is ideal those of us chasing serious horsepower.