Designed and constructed to the exact same specifications as MBRPs Pro Series you can expect the same improvements in torque and horsepower and the same awesome sound as MBRP top of the line products. The difference is the heavy duty aluminized steel construction. You save money without compromising on performance. Heavy sixteen gauge steel is one reason. Another is that MBRP systems have a thick protective coating of aluminum silica on the seams, an area that is often left exposed to rust. MBRP backs them with a 3 year warranty.