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MagnaFlow’s cat-back system (part no. 15628) for the 5.7L HEMI Charger is a 2.5” stainless steel exhaust that is an exact fit design. Included with the cat-back system is a left and right rear muffler, a center muffler, a pair of pipes to connect the center muffler to the catalytic converter extensions, and six exhaust clamps to secure the entire assembly. All the exhaust hanger provisions are welded to the pipes in the stock location.
In the continued quest for increased performance from the Pennsylvania College of Technology’s 2006 Dodge Charger 5.7L HEMI, we recently had the opportunity to work with exhaust components from MagnaFlow. Following the tried and true method that has been employed in previous tests, the Mustang chassis dynamometer will be used to evaluate the performance of bolt-on components; these are components that the average enthusiast can install in a few hours with basic hand tools. The parts being evaluated are MagnaFlow’s cat-back exhaust system and then the cat-back system in conjunction with a pair of their Direct Fit Catalytic Converters. Lastly, the Hemi will be tuned to maximize the MagnaFlow exhaust system for the greatest performance numbers.
MagnaFlow had two large boxes shipped to Penn College. In one of the two large boxes was the cat-back system (part no. 15628) designed for the 5.7L HEMI Charger and other similarly equipped Chrysler/Dodge products. The box was stuffed full of exhaust tubing consisting of two pipes (one 23” and one 24.5” in length), a 5” x 8” x 18” resonator (center muffler assembly), two 4” x 9” x 14” muffler assemblies (driver and passenger side), and six 2.5” clamps. The entire cat-back system is a slip fit style made of 2.5” stainless steel with a highly polished 4” tip extending from each muffler.
Before the installation of the cat-back exhaust pipes, a series of dyno runs had to be performed to establish a baseline for future comparison. The Charger was backed up onto the Penn College Mustang chassis dyno. With the Charger properly tightened down, the tire air pressure adjusted, the weather station calibrated, and the Hemi and drive train up to operating temperature three baseline runs were made with a variation of less than 1% between each run. The rpm range for all the testing was 2800-5500 rpm. The runs established a baseline maximum of 297.2 lb/ft of torque at 4400 rpm and 272.6 horsepower at the drive wheels at 5200 rpm. The average torque was 277.1 lb/ft and an average of 221.6 horsepower. These numbers were very similar to previous baseline runs with the Charger in a factory stock tune with all the factory parts.