As a high performance auto buff - whether a professional race driver or enthusiastic amateur - you're well aware of the effect that an exhaust system can have on your engine's horsepower output. Ideally, your engine should be able to vent that exhaust directly from the cylinders to the outside. However, there are many practical issues that come into play - for example, an oxygen (O2) sensor is really something you shouldn't be without, since it is necessary for your fuel injectors to work at full efficiency. If yours is a street vehicle, you are legally required to have a working catalytic converter as well as a muffler. So, the best compromise is to have an exhaust system that allows your engine to rid itself of waste products with as little effort as possible. The BBK X Pipe not only provides a smooth, unobstructed exit for exhaust gases, it balances the outgoing flow between the two banks of cylinders. In plain language, the BBK X Pipe creates a vacuum that actually allows exhaust gases to be "sucked" out, so the engine doesn't have to work as hard at "pushing" them out. A BBK X Pipe can add up to 20 horsepower to your engine's output. Customers always deserve professional technical support while purchasing reliable car or truck parts. Thus, we make available a 24/7/365 sales help call center to aid you with your requests. Nobody likes to pay for shipping, so we always offer totally free shipping on every order above $50. If you find a better price, let us know - we will beat any legitimate auto part price.