MagnaFlow's Street Series cat-back system (MPN 15715) is a bolt-on replacement for the stock exhaust that begins behind the catalytic converter on the first-generation Miata NA. The manufacturer lists it for 1990-1993 Mazda Miata 1.6L and 1994-1997 Mazda Miata 1.8L models. The 4-inch polished, double-wall angle-cut tip is the most visible change at the rear. Owners on user forums report that the complete system weighs about 24.5 lb, roughly 9.5 lb less than the stock setup they replaced, so it is a practical choice for NA owners chasing lighter weight with a deeper note. Buyers searching for a 1990-1997 Miata NA cat-back exhaust, an MX-5 NA bolt-on cat-back, or a Miata M1 exhaust should note that the design targets this chassis directly, which avoids the fabrication a generic kit may require.
Installation is a bolt-on job. The manufacturer lists the inlet as bolt-on and says a gasket or seal is included. The manufacturer also says basic automotive knowledge is needed for proper installation and recommends professional installation. Owners on user forums describe the midpipe flange as tight, and removing the brace bolts took a breaker bar. Tip alignment is the common fussy point: one owner had to shift the tip off-center to avoid rattling against the differential, then trimmed the muffler slip joint to gain clearance. Plan for careful tip-to-bumper spacing, and check the stock hangers before you start.
The manufacturer describes the inlet as bolt-on and states that a gasket or seal is included, so no welding is called for in its installation information.
The manufacturer's listing says no mounting bracket is included. Owners on user forums recommend stiffer exhaust mounts instead of old rubber hangers, since clearances can get tight.
Expect a bolt-on job that is manageable with ramps or a lift, a breaker bar for stubborn brace bolts, and a helper for the tip-to-bumper alignment. Owners on user forums report that the midpipe flange is cramped when working from under the rear of the car. Dry-fit the entire system before tightening any hangers, and set the tip position first so the muffler can be adjusted to avoid rattling.
