Radium Injector Seats 26mm - 2004-2006 Subaru STI
Radium Injector Seats 26mm - 2004-2006 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.
These are the Radium Engineering 26mm Machined Aluminum Injector Seats that are used in Radium's fuel rails. These are required when converting the OEM fuel injector to aftermarket fuel injectors. They simply press-fit into the intake manifold / TGV injector ports with no modifications required. Using the included FKM O-ring, they seal into the machined injector counterbore preventing vacuum or boost leaks. The injector seat bores are designed to be used with a common 14mm lower injector O-ring.
HIGHLIGHTS:
- CNC-machined6061 aluminum construction
- 26mm 4-cylinder profile
- laster-etched logo
- Anodized black finish
- These will be used to convert side feed injectors to top feed injectors
- FKM O-rings
- Available for those of you who need direct replacements
- Designed to be used with Radium Engineering's fuel rails
- Required when converting the OEM fuel injector to aftermarket fuel injectors
- The FKS O-rings seal into the machined injector counterbore preventing vacuum or boost leaks
- Designed to be used with a common 14mm lower injector O-ring
- Sols as a set of (4) injector seats
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.
These are the Radium Engineering 26mm Machined Aluminum Injector Seats that are used in Radium's fuel rails. These are required when converting the OEM fuel injector to aftermarket fuel injectors. They simply press-fit into the intake manifold / TGV injector ports with no modifications required. Using the included FKM O-ring, they seal into the machined injector counterbore preventing vacuum or boost leaks. The injector seat bores are designed to be used with a common 14mm lower injector O-ring.
HIGHLIGHTS:
- CNC-machined6061 aluminum construction
- 26mm 4-cylinder profile
- laster-etched logo
- Anodized black finish
- These will be used to convert side feed injectors to top feed injectors
- FKM O-rings
- Available for those of you who need direct replacements
- Designed to be used with Radium Engineering's fuel rails
- Required when converting the OEM fuel injector to aftermarket fuel injectors
- The FKS O-rings seal into the machined injector counterbore preventing vacuum or boost leaks
- Designed to be used with a common 14mm lower injector O-ring
- Sols as a set of (4) injector seats
Share
