The Supreme SP for the Subaru STI Sedan features much larger diameter piping, resonators and mufflers, but also smooths 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.

Make: Subaru

Model: (GV8) WRX STI sedan

Years: 2011-14

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

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

Notes: Reuse factory doughnut-gasket and hardware for mid-pipe

HP: +14 hp

TRQ: +22 ft-lbs