The Aluminized Custom Builder Pipe Kit Series has a limited 1 year warranty and offers the most options for customization. For the Racer, it provides a mandrel bent pipe-only exhaust from Turbo to tailpipe complete with all hardware. For the street driver, the CBPK is the basis for a custom exhaust that allows you to purchase and install the converter, muffler and tip of your choice. Custom Builder Series Downpipe-Back Exhaust System; 4 in.; Incl. Tubing/Tailpipes/Hardware; No Tip Incl.; Single Pass. Side Rear Exit; Stainless; The Custom Builder Pipe Kit features stainless construction and offers the most options for customization. Complete your system with the required converter, muffler and tip for your application.