UPR products X-over Pipe package for the 2004 includes a pair of O2 sensor extensions to make your install quick and easy! UPR's new X-over Pipe is the best fitting system available without question. UPR's new kit offers better ground clearance than every other X-over pipe available. Also unlike all the competitors so Called X-over Pipes that use a box design or stamped steel that mimic a real X-over Pipe design but have settled for a cheap design that is not the real deal in Horsepower or Sound ! UPR's X-over Pipe will add as much as 20+HP. We are the manufacturer and one of the pioneers of the X-over Pipe we have been using this design on every race and street car application since late 1995. UPR has used this on all of their record setting race cars from the beginning and continue to use them because they give unmatchable performance, from improving idle quality to great bottom end and mid range to an incredible top end charge. This kit is a must for all 4.6L engines naturally aspirated and power adder equipped. Automatic or manual this X-over Pipe fits them all. H-pipes are a thing of the past. Like a rotary dial telephone they are just flat out old news. Off Road use only....