XP Series 409 SS Cat-Back Exhaust System (S5338409) by MBRP. Series: XP Series. Exhaust Pipe Material: Stainless Steel. Exhaust Type: Cat-Back. Main Piping Diameter: 3". Exit Location: Single Side Exit. Tip Outlet Diameter: 4". Tip Shape: Round. The XP series exhausts from MBRP is for the no-compromise enthusiast who insists on a rugged system that can take whatever the road throws at it and last. Constructed entirely of corrosion-resistant T409 stainless steel, this system will show some light surface discoloration after a while, but will never corrode through.
