2004-21 Subaru WRX STi | 02-14 WRX Impreza T-304 Up-Pipe
2004-21 Subaru WRX STi | 02-14 WRX Impreza T-304 Up-Pipe
EOS Exhaust
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PRODUCT DETAILS
2004-21 Subaru WRX STi | 02-14 WRX Impreza T-304 Up-Pipe
COMPATIBILITY: 2015-2021 Subaru WRX STiex
MATERIAL: T-304 Stainless Steel
SURFACE FINISH: Anodized Silver | Blue Burnt Tips
TYPE: Muffler Dual Delete Axle Back
EXIT TYPE: Quad Tips
TIP WALL TYPE: Double Wall Tip
TIP SHAPE: Round Angle Cut
EXHAUST TIP DIAMETER: 4 Inches
EXHAUST PIPE DIAMETER: 2.5 Inches
PERFORMACNE:
- Flow Bench Results vs. OEM at 28" WC
- OEM Catless - 244.6 CFM
- OEM Catted - 164.7 CFM
- Extreme Online Store - 292.6 CFM
PACKAGE INCLUDED:
A Pair of Subaru WRX STi Muffler Delete Axle-Back Quad Burnt Tips Exhaust, 2 Pair of Hangers, 1 Pair of Gasket, 1 Bag of Hardware
The Extreme Online Store Up-Pipe has been made with beefy local raw materials. The flex joint is 321 Stainless Steel w/ an Interlocking Liner and tubing is a heavy-duty 14 Gauge 304 Stainless Steel that has been CNC Mandrel Bent and finished up with a nice brushed finish. Their flanges are made out of 1/2" 304 Stainless Steel and are fully machined on all sides. The insides of their flanges are "cut-back" to allow the pipe to rest inside the flange which gives you a nice flush mating surface thus allowing optimal flow through the pipe.
Professional Installation is Recommended
WHY WE CARRY THIS
We only list parts we’d run ourselves or recommend to a friend building a real car. If it feels vague, unverified, or inconsistent, it doesn’t make the cut.
- Fitment-first mindset — no “universal” roulette
- Brand reputation matters — we favor proven manufacturing
- Support that actually responds with real answers
WHAT TO EXPECT
This is the clean path: correct fitment, clean install, and results that match the intent.
- Install-ready experience with correct mounting where provided
- Finish that holds up to real driving, not just photos
- Selections on this page drive the exact fitment shipped
TRUST, BUILT INTO THE PROCESS.
Anyone can list parts. We curate what belongs on a serious build. Our goal is simple: fewer surprises, cleaner installs, and confidence when you hit “Buy.”
Fitment checked
We prioritize vehicle-specific listings and clear selection logic so you’re not gambling on compatibility.
Brand discipline
Proven manufacturing and consistent quality matter more than hype. We bias toward what actually holds up.
Real support
If you have a question, you’ll get a human answer that helps you finish the build — not a copy-paste shrug.
2004-21 Subaru WRX STi | 02-14 WRX Impreza T-304 Up-Pipe
COMPATIBILITY: 2015-2021 Subaru WRX STiex
MATERIAL: T-304 Stainless Steel
SURFACE FINISH: Anodized Silver | Blue Burnt Tips
TYPE: Muffler Dual Delete Axle Back
EXIT TYPE: Quad Tips
TIP WALL TYPE: Double Wall Tip
TIP SHAPE: Round Angle Cut
EXHAUST TIP DIAMETER: 4 Inches
EXHAUST PIPE DIAMETER: 2.5 Inches
PERFORMACNE:
- Flow Bench Results vs. OEM at 28" WC
- OEM Catless - 244.6 CFM
- OEM Catted - 164.7 CFM
- Extreme Online Store - 292.6 CFM
PACKAGE INCLUDED:
A Pair of Subaru WRX STi Muffler Delete Axle-Back Quad Burnt Tips Exhaust, 2 Pair of Hangers, 1 Pair of Gasket, 1 Bag of Hardware
The Extreme Online Store Up-Pipe has been made with beefy local raw materials. The flex joint is 321 Stainless Steel w/ an Interlocking Liner and tubing is a heavy-duty 14 Gauge 304 Stainless Steel that has been CNC Mandrel Bent and finished up with a nice brushed finish. Their flanges are made out of 1/2" 304 Stainless Steel and are fully machined on all sides. The insides of their flanges are "cut-back" to allow the pipe to rest inside the flange which gives you a nice flush mating surface thus allowing optimal flow through the pipe.
Professional Installation is Recommended
