Black Series Cat-Back Exhaust System (5142BLK) by MBRP. Series: Black Series. Exhaust Pipe Material: Aluminized Steel. Exhaust Type: Cat-Back. Muffler Sound: Moderate. Exit Location: Single Side Exit. Murder out your vehicle with a black exhaust system. Specially coated in high heat black, these aluminized steel systems are the hottest thing in the exhaust market today. They�re manufactured with the same processes and on the same tooling as MBRP�s high-end stainless steel exhaust systems, so you know the build quality is there. They provide a mellow but authoritative sound.