Find a huge variety of Silicone Couplers & Boots you need to finish your project 1992-2006 & 2009-2016 Volkswagen 1.9L/2.0L TDI. You can find couplers ranging in size from 2� all the way up to 6� diameter. Straight, hump, reducing, and angled couplers ranging in 45 to 90 degree bends are available to fit almost any need. These rubber or silicone boots offer greater longevity as they are reinforced for strength. With high-quality brands like PPE, Vibrant, Mishimoto, and Full Send, you�ll find what you need at XDP.