Radium Fuel Rails Top Feed Upgrade - Subaru Models (inc. 2002-2014 Subaru WRX / 2007+ Subaru STI)
Radium Fuel Rails Top Feed Upgrade - Subaru Models (inc. 2002-2014 Subaru WRX / 2007+ Subaru STI)
Radium Engineering
Couldn't load pickup availability
- ✔ Verified fitment & authentic brands
- ✔ Secure checkout via Shopify, Stripe, and PayPal
- ✔ Enthusiast-run support — not a marketplace
- ✔ Fair resolution on damaged or incorrect orders
Every product is sourced from authorized manufacturers or distributors. If something isn’t right with fitment or condition, we’ll work with you to resolve it fairly.
NO GUESSWORK,
JUST PARTS THAT WORK.
Let’s finish that car.
PRODUCT DETAILS ▾
RallySport Direct carries highly engineered products designed to improve the performance and longevity of your vehicle brought to you by Radium Engineering.
This is the Radium Engineering Top Feed Fuel Rail Upgrade w/Top Port. This kit will allow you to upgrade to a larger variety of fuel injector sizes while having a larger internal bore size needed to support all necessary engine power requirements. These rails are CNC machined from solid 6061 aluminum materials and are black anodized and laser-etched for a high-quality surface finish. These rails are designed specifically for OEM or equivalent fitment injectors. For injector height flexibility and thermal insulation, 2 sets of machined insulating spacers are included. All injectors must use 11mm diameter upper O-rings just like the OEM Subaru injectors.
HIGHLIGHTS:
- CNC machined from solid 6061 aluminum construction
- Black anodized and aluminum etched
- 8AN ORB threaded ports
- 8AN top port design
- Allows for a larger variety of aftermarket injectors
- Will fit OEM-like or equivalent injectors
- Includes thermal insulating press-in spacers for injector height flexibility
- Includes stainless steel M8 x 1.25 mounting bolts
NOTE:
- All injectors must use 11mm diameter upper O-rings just like the OEM Subaru injectors
- These particular fuel rails will have the 8AN top port design
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.
RallySport Direct carries highly engineered products designed to improve the performance and longevity of your vehicle brought to you by Radium Engineering.
This is the Radium Engineering Top Feed Fuel Rail Upgrade w/Top Port. This kit will allow you to upgrade to a larger variety of fuel injector sizes while having a larger internal bore size needed to support all necessary engine power requirements. These rails are CNC machined from solid 6061 aluminum materials and are black anodized and laser-etched for a high-quality surface finish. These rails are designed specifically for OEM or equivalent fitment injectors. For injector height flexibility and thermal insulation, 2 sets of machined insulating spacers are included. All injectors must use 11mm diameter upper O-rings just like the OEM Subaru injectors.
HIGHLIGHTS:
- CNC machined from solid 6061 aluminum construction
- Black anodized and aluminum etched
- 8AN ORB threaded ports
- 8AN top port design
- Allows for a larger variety of aftermarket injectors
- Will fit OEM-like or equivalent injectors
- Includes thermal insulating press-in spacers for injector height flexibility
- Includes stainless steel M8 x 1.25 mounting bolts
NOTE:
- All injectors must use 11mm diameter upper O-rings just like the OEM Subaru injectors
- These particular fuel rails will have the 8AN top port design
Share
