Engineered as a Street Series cat-back, the MagnaFlow 15671 replaces your ride's stock exhaust components from near the catalytic converter on back. It fits the 4.6L V8 in 1999-2004 Ford Mustang GT models and uses two straight-through mufflers ending in a Dual Split Rear exit with 3.5in. Polished Clamp-On Single Wall Angle Cut Edge tips. The manufacturer highlights durable corrosion-resistant stainless steel construction and extensive 3D scanning during development, which it says produces a direct-fit, OEM-like result. It also describes the design as dyno-proven, though it does not publish a horsepower figure in the material I reviewed.
The bolt-on design is aimed at owners who want a 1999-2004 Mustang GT 4.6L cat-back exhaust, a stainless dual split rear setup, or a 3.5 inch polished tip kit without cutting or welding. The manufacturer says all the hardware necessary for do-it-yourself installation is included, but it also notes that basic automotive knowledge helps and that professional installation is always recommended. Gaskets and the mounting bracket are not in the box, so confirm you have usable factory hardware and gaskets before the job starts.
The manufacturer states the system was developed using extensive 3D scanning to achieve OEM-like fitment, and it is listed as a bolt-on installation for the 4.6L Mustang GT.
No. The manufacturer's specifications list both a gasket or seal and a mounting bracket as not included, so check your existing hardware and gaskets before installing.
The manufacturer says the system is designed for do-it-yourself installation with included hardware, but recommends basic automotive knowledge and suggests professional installation when possible.
Per the manufacturer, this is a bolt-on cat-back with all mounting hardware included, so it is within reach of a home mechanic who is comfortable working under a raised vehicle. Plan for the job to require basic automotive knowledge and access to the rear exhaust hangers. Because the gasket and mounting bracket are not included, buy replacement gaskets and inspect the factory hangers before you start, and do not rely on the kit alone to complete the install.
