GReddy's Supreme SP Cat-Back for the GR86 and BRZ Keeps the Factory Cat and Bumper Cutouts

The second-generation GR86 and BRZ fixed the old car's torque dip and gave the boxer more displacement, but nobody bought one for the factory exhaust note. GReddy's Supreme SP cat-back is its latest answer, and PASMAG reported on September 1 that it is available now through GReddy's online store for the 2022-and-newer GR86 (ZN8) and BRZ (ZD8).

It is a three-piece system with 63.5 mm (2.5-inch) piping. The mid-pipe is a straight-through design with dual resonators, feeding a horizontally mounted muffler with a single inlet and dual outlets. Out back are dual 115 mm (4.5-inch) slant-cut, double-wall tips that line up with the factory bumper outlets.

The details that matter

Two things make this a street-friendly system. First, it retains the factory catalytic converter and front pipe, so it bolts on behind the cat. Second, the tips are designed for the stock bumper cutouts, which means no trimming and a clean factory-plus look. Dual resonators in the mid-pipe are there to take the rasp out of a flat-four, which can get harsh with a straight pipe.

GReddy has a long history in this chassis, back to the first-generation cars, and its Supreme line has always leaned toward a refined sound rather than maximum volume. The SP follows that line on paper.

Why it matters

The GR86 and BRZ are the most popular entry point into the JDM and grassroots drift scene right now, and exhaust is usually the first mod. A cat-back that keeps the cat and fits the factory bumper is the kind of part you can install on a Saturday and drive to work on Monday. Price, weight and sound levels were not included in the report PASMAG published. If you are shopping, ask your dealer for a sound clip and a weight against the factory system, since those are the two numbers that will decide whether this beats the long list of GR86 cat-backs already on the market. GReddy sells it through its own online store, so that is the first place to check.