MagnaFlow also supplied a universal 3-inch x pipe system that allowed us to connect the American Racing headers to the MagnaFlow after-cat. After the installation of the exhaust components, the peak power numbers jumped to 802 hp and 714 lb-ft of torque. This test is a perfect example of why we include graphs (not just peak numbers), as the exhaust upgrades improved power production throughout the rev range with a maximum gain of 62 hp and 60 lb-ft of torque at 5,400 rpm. While we changed two components at once for this test, the huge gains in the midrange certainly indicate the scavenging effect produced by the long-tube headers was present and accounted for.
 The Magnaflow after-cat was...  The Magnaflow after-cat was fed by a 3-inch x pipe system. Stealth mode is definitely a thing of the past with this exhaust system. |  Stock Exhaust VS. American...  Stock Exhaust VS. American Headers And Magnaflow ExhaustA Review of the graph illustrates the exhaust upgrade dramatically improved the power output of the supercharged 4.6L motor. Run with the stock exhaust manifolds, stock after-cat (with aftermarket mufflers) and no cats, the supercharged motor produced 779 hp and 691 lb-ft of torque. After the installation of the American Racing headers, MagnaFlow 3-inch after-cat exhaust, and x pipe system, the peak power numbers jumped to 802 hp and 714 lb-ft of torque. What was really impressive were the tremendous gains experienced throughout the rev range. |  Magnaflow Stainless steel...  Magnaflow Stainless steel mufflers fed tapered exhaust tips that fit perfectly in the rear valance. |
 After Installation of the...  After Installation of the American Racing headers and MagnaFlow exhaust system, the power numbers jumped from 779 hp and 691 lb-ft to 802 hp and 714 lb-ft. Even more impressive than the peak power gains was the fact that the exhaust upgrade increased the power output throughout the rev range. How does a gain of 62 hp and 60 lb-ft at 5,400 rpm sound? | | |