According to MBRP, the new Chevy Silverado ZR2 cat-back exhaust includes 3-inch and 2.5-inch piping, providing a 33-percent increase in flow. It also includes dual rear-exit design, while the ...

Run with the stock exhaust manifolds and 2.5-inch exhaust, the supercharged 5.4L motor produced 753 hp at 6,500 rpm and 619 lb-ft at 5,400 rpm at a peak boost reading of 14.1 psi.