GReddy 09-14 Subaru STI Hatchback Supreme SP Exhaust
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The Supreme SP for the Subaru STI hatchback features a large horizontally mounted, 3-section muffler with a "tucked-away" layout. This routing allows for the large 3” diameter piping to more smoothly enter the muffler’s center section. Exhaust gases exit each side of the revised muffler via the two 2.5” diameter piping to quad staggered 3.5” GReddy double-wall slash cut tips, The non-tapered 3” mid-pipe also encases a large resonator section to tune-out drone. Like all GReddy Supreme SP systems the fully hand-welded 304 Stainless-Steel exhaust carries a Limited Lifetime Warranty.
Chassis: GRB
Engine: EJ25
Type: cat-back system
(horizontally mounted muffler with dual outlets)
Number of pieces: 3
Piping: 76 mm (3") - 2x 63.5mm (2.5")
Tip(s): 4x 89mm (3.5 ")
Gasket(s): 3" oval (qty: 2 included) replacement
Resonator: Yes
Notes: reuse factory doughnut-gasket and hardware for mid-pipe
Weight: 39.8lbs (-2.8lbs)
Sound level: L82 / R83 dB(a) @4000
Dyno Chart
HP: +TBA hp
TRQ: +TBA ft-lbs
| Exhaust System Sound | Moderate |
| Exhaust System Type | Cat-Back |
| Exhaust Tubing Material | 304 SS |
| Exit Location | Quad Rear |
| Main Tubing Diameter | 3" to 2.5" |
| Muffler Quantity | 1 |
| Resonator | Yes |
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