BOOBX Performance Exhaust Downpipe 05-08 Audi A4 Quattro 2.0L B7 MT Down Pipe Precision Computer CNC machined flanges with DUAL-TIG welded construction High quality mandrel bend for ultra fast flow Dyno tested at low end and top speed to increase horsepower Precision mandrel-bend to enhance exhaust gas flow Backed by Limited Lifetime warranty from manufacturer's defects