The legacy of the GReddy SP lives on with GReddy’s best version yet, the Supreme SP and to prove it carries a limited lifetime warranty! From the 1st flange to the new double-wall GReddy Tip, each Supreme SP system features a high-quality, hand Tig-weld 304 stainless-steel outer construction. Within the muffler, new straight-through and directed- straight-though chambered muffler designs allow GReddy to engineer a more refine exhaust note while increasing exhaust flow and performance. Classic GReddy street performance styling is maintained with excellent fitment and a stylish exhaust system layout. The Supreme SP not only designed to perform and sound great for each specific application; it matches the vehicle’s body-lines and styling.

The Supreme SP for the Subaru STI Sedan features much larger diameter piping, resonators and mufflers, but also smoothes the layout for maximum performance with good sound suppression. This cat-back exhaust starts out with a full 3” mid-pipe with a large straight-through resonator to tune out drone. The next section smoothly transitions into dual 2.5” diameter piping. Improved dual GReddy straight-through mufflers with dual, double wall tips on each muffler finish off the exhaust. GReddy designers carefully position the dual mufflers and staged tips to flow with the GV-chassis’ bodylines. Like all GReddy Supreme SP systems the fully hand-welded 304 Stainless-Steel exhaust carries a Limited Lifetime Warranty

Vehicle(s): WRX & STI Sedan
Chassis:  GV8
Engine:  EJ257
Type:  cat-back, dual muffler system

Number of pieces:  4
Piping:   76 mm (3″) – 2x 63.5mm (2.5″)
Tip(s):  4x 89 mm (3.5″)
Gasket(s):  2x 2.5″ & 1x 3″ oval (qty: 3 included) replacement(s)
Resonator:   Yes

Weight: TBA  lbs
Sound level:  L89 & R91 dB(a) @4000

Notes: reuse factory doughnut-gasket and hardward for mid-pipe

Dyno Chart
HP:  +14 hp
TRQ:  +22 ft-lbs