The MagnaFlow Street Series cat-back system (part 16649) replaces the factory exhaust from just behind the catalytic converter to the rear of the vehicle on the 4.0L V6 Toyota FJ Cruiser. The manufacturer's Street/Touring line balances a deep, smooth performance sound with moderate sound levels and increased performance. The kit uses 2.5-inch main piping, one straight-through muffler, and a polished tip that exits on the passenger-side rear. Buyers choosing between this and a muffler-only swap get the full piping upgrade. Owners on user forums say the tone is deeper than stock, but some also describe cabin drone at highway speeds, so consider the tradeoff before buying. Search terms like 2007-2014 FJ Cruiser 4.0L cat-back, Street Series muffler, and FJ Cruiser V6 exhaust upgrade all point to this kit.
The manufacturer lists a verified fit for 2007-2014 Toyota FJ Cruiser 4.0L models, and the system is designed as a bolt-on installation. Performance gains are the main question for most buyers. Exhaust upgrades on this engine typically yield modest results, so pair it with other intake or header work if horsepower is the goal. Lower-cost muffler-only options exist, but they do not replace the piping. The result is a louder, more distinct V6 note that suits street and light-trail driving.
The manufacturer lists a verified fit for 2007-2014 Toyota FJ Cruiser 4.0L models.
Owners on user forums report interior drone in the 35-50 mph range with this muffler. Some owners replaced the muffler to reduce it and reported a lower, quieter rumble. Experiences vary, so confirm with the manufacturer if noise levels are a priority.
The system is a bolt-on cat-back, so no cutting of the catalytic converter is required. Owners on user forums report that one hanger near the hitch needed adjustment to gain clearance, so check the routing before tightening everything. If you are removing a factory exhaust, expect welded joints that may need cutting, as one forum owner did. Installation difficulty and tool requirements were not confirmed in the manufacturer's materials, so review the install sheet before starting.
