Raceonly Billet AST Delete kit for FD3S RX7 - Gen3
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- Fast, tracked shipping
- Price-match guarantee
- Authorized RaceOnly distributor
Select items are stocked in the USA — others ship from the manufacturer. Delivery calculated at checkout.
Designed and made in Australia by RaceOnly, this billet AST delete kit replaces both the factory thermostat housing/water neck and the plastic air separator tank on 1993–2002 FD3S RX-7 models. Machined entirely from aircraft-grade 6061 billet aluminum, this direct bolt-on solution offers improved coolant flow, enhanced air separation, and eliminates the fragile plastic AST bottle prone to failure.
Its compact design frees up additional space for larger turbochargers—even layouts using Turblown G42 units. The kit retains compatibility with factory components such as the metric-thread water level sensor, overflow tank, radiator hoses, and AST cap. For more versatility, it includes both OEM radiator hose integration and a built-in AN-16 fitting. The reduced flange diameter (by 2mm) enables tighter turbo placement without compromise. Finished in durable black powder coat, this upgrade is ideal for both street and race builds.
Key Features
-Made in Australia by RaceOnly
-Replaces OEM thermostat housing and plastic air separator tank
-Precision machined from 6061 billet aluminum
-100% direct bolt-on installation
-Maintains factory sensor, hoses, overflow tank, and cap compatibility
-Compact design increases turbo clearance
-Compatible with single and sequential twin-turbo FD3S RX-7 (1993–2002) builds
-Includes both OEM radiator hose routing and AN-16 fitting
-2mm smaller flange allows better fitment with large turbos
-Black powder-coated finish for durability
-Enhances coolant passage and air separation for reliable cooling
What's Included
-(3) M6 × 20mm stainless bolts
-Dash 6 ORB male AN adapter
-Dash 6 ORB plug
-90° push-lock 3/8″ barb fitting
-Spring clamp for overflow bottle hose
- Brand
- RaceOnly
- Platform
- Mazda RX-7
- Engine
- 13B-REW
- Category
- Radiators
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What customers say
Trusted by JDM builders
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★★★★★
J-Spec Garage is my first stop for JDM parts now—fast shipping and no surprises.
Alex M.
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★★★★★
They actually took the time to help me choose the right setup for my GT-R. That alone won me over.
Brian S.
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★★★★★
Everything arrived well packed and exactly as described. You can tell car people run this shop.
Chris D.
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★★★★★
I've ordered three times now and it's been consistent every time—accurate, quick, and hassle-free.
Daniel R.
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★★★★★
Customer support answered my fitment questions in detail instead of just sending a link. That meant a lot.
Jason L.
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★★★★★
Parts for my Supra showed up on time and bolted right up. No guessing, no drama.
Kevin P.
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★★★★★
Site is easy to navigate and checkout was simple. Whole experience felt dialed in.
Nate H.
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★★★★★
Communication was excellent from order confirmation to delivery updates. I always knew what was happening.
Ryan F.
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★★★★★
These guys are clearly enthusiasts. The brands they stock and how they talk about them says everything.
Tyler N.
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★★★★★
I've dealt with plenty of parts shops—this is one of the few I trust with big-ticket items.
Zach W.
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★★★★★
My 240SX build depends on good vendors. J-Spec Garage has delivered every time so far.
Cody J.
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★★★★★
You can tell they care about the scene, not just sales. That's why I keep going back.
Dylan P.
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★★★★★
I had an issue with a manufacturer drop-ship and J-Spec Garage handled it for me. That's real customer service.
Josh H.
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★★★★★
The coilovers for my S13 came packed perfectly and ride exactly how they advertised. Super happy.
Kyle M.
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★★★★★
Grabbed both parts and merch—quality on both sides. Cool to support a shop that supports the community.
Sean L.
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★★★★★
I recommend J-Spec Garage to anyone building a JDM car. Solid parts and people who know the platforms.
Omar V.
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★★★★★
The RaceOnly parts I grabbed for my RX-7 were top-notch. Fitment was perfect and the car feels night and day better.
Aaron F.
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★★★★★
Finding legit rotary parts is tough, but J-Spec Garage came through with RaceOnly gear that actually delivers.
Blake S.
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★★★★★
Finally found a shop that understands rotary builds. The RaceOnly pieces I ordered have held up great under real abuse.
Jake P.
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★★★★★
Everything for my FD—from RaceOnly parts to small accessories—showed up clean, labeled, and ready to bolt on.
Mason K.
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★★★★★
I've ordered RaceOnly gear from other places before, but the service and communication from J-Spec Garage were on another level.
Noah V.
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★★★★★
The RaceOnly pieces for my RX-7 build fit exactly like they should. No grinding, no modifying, just bolt-on and go.
Owen T.
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★★★★★
It's hard to find a shop that really understands rotary builds, but J-Spec Garage clearly does.
Caleb M.
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★★★★★
Real rotary parts, solid communication, and no nonsense. Exactly what I want from a parts shop.
Isaac R.
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★★★★★
The Supra parts I ordered were clearly not cheap eBay stuff—quality brands and everything matched the listing perfectly.
Adrian C.
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I've been slowly building my MK4 and every order from J-Spec has shown up on time and ready to install.
Carlos N.
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★★★★★
They actually understood what I was trying to do with my Supra build and suggested parts that made sense, not just the priciest options.
Derek W.
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★★★★★
The turbo-related parts for my Supra came exactly as described and have held up great under boost. Zero complaints.
Javier S.
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★★★★★
I appreciate that they stock real-deal brands for Supra builds instead of filling the catalog with questionable stuff.
Miguel R.
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★★★★★
I'm picky about what goes on my MK4. J-Spec Garage earned my trust with accurate listings and solid communication.
Steven D.
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★★★★★
I've had a great experience ordering Supra parts here—accurate listings, fair pricing, and quick shipping.
Marcus D.
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★★★★★
It's refreshing to buy Supra parts from a shop that actually knows the platform.
Preston G.
-
★★★★★
The turbo and supporting parts I got for my Supra were exactly what I needed. Everything matched the listing.
Trevor M.
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★★★★★
If you're building an RX-7 or Supra, this is a shop you want to know. RaceOnly parts for the rotary and quality Supra gear in one place is a win.
Victor H.
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★★★★★
It didn't feel like I was buying from a generic online store. It felt like a shop built for enthusiasts.
Wyatt N.
-
★★★★★
Good communication, real brands, and parts that showed up when they said they would. Hard to beat that.
Zachary R.
-
★★★★★
J-Spec Garage is my first stop for JDM parts now—fast shipping and no surprises.
Alex M.
-
★★★★★
They actually took the time to help me choose the right setup for my GT-R. That alone won me over.
Brian S.
-
★★★★★
Everything arrived well packed and exactly as described. You can tell car people run this shop.
Chris D.
-
★★★★★
I've ordered three times now and it's been consistent every time—accurate, quick, and hassle-free.
Daniel R.
-
★★★★★
Customer support answered my fitment questions in detail instead of just sending a link. That meant a lot.
Jason L.
-
★★★★★
Parts for my Supra showed up on time and bolted right up. No guessing, no drama.
Kevin P.
-
★★★★★
Site is easy to navigate and checkout was simple. Whole experience felt dialed in.
Nate H.
-
★★★★★
Communication was excellent from order confirmation to delivery updates. I always knew what was happening.
Ryan F.
-
★★★★★
These guys are clearly enthusiasts. The brands they stock and how they talk about them says everything.
Tyler N.
-
★★★★★
I've dealt with plenty of parts shops—this is one of the few I trust with big-ticket items.
Zach W.
-
★★★★★
My 240SX build depends on good vendors. J-Spec Garage has delivered every time so far.
Cody J.
-
★★★★★
You can tell they care about the scene, not just sales. That's why I keep going back.
Dylan P.
-
★★★★★
I had an issue with a manufacturer drop-ship and J-Spec Garage handled it for me. That's real customer service.
Josh H.
-
★★★★★
The coilovers for my S13 came packed perfectly and ride exactly how they advertised. Super happy.
Kyle M.
-
★★★★★
Grabbed both parts and merch—quality on both sides. Cool to support a shop that supports the community.
Sean L.
-
★★★★★
I recommend J-Spec Garage to anyone building a JDM car. Solid parts and people who know the platforms.
Omar V.
-
★★★★★
The RaceOnly parts I grabbed for my RX-7 were top-notch. Fitment was perfect and the car feels night and day better.
Aaron F.
-
★★★★★
Finding legit rotary parts is tough, but J-Spec Garage came through with RaceOnly gear that actually delivers.
Blake S.
-
★★★★★
Finally found a shop that understands rotary builds. The RaceOnly pieces I ordered have held up great under real abuse.
Jake P.
-
★★★★★
Everything for my FD—from RaceOnly parts to small accessories—showed up clean, labeled, and ready to bolt on.
Mason K.
-
★★★★★
I've ordered RaceOnly gear from other places before, but the service and communication from J-Spec Garage were on another level.
Noah V.
-
★★★★★
The RaceOnly pieces for my RX-7 build fit exactly like they should. No grinding, no modifying, just bolt-on and go.
Owen T.
-
★★★★★
It's hard to find a shop that really understands rotary builds, but J-Spec Garage clearly does.
Caleb M.
-
★★★★★
Real rotary parts, solid communication, and no nonsense. Exactly what I want from a parts shop.
Isaac R.
-
★★★★★
The Supra parts I ordered were clearly not cheap eBay stuff—quality brands and everything matched the listing perfectly.
Adrian C.
-
★★★★★
I've been slowly building my MK4 and every order from J-Spec has shown up on time and ready to install.
Carlos N.
-
★★★★★
They actually understood what I was trying to do with my Supra build and suggested parts that made sense, not just the priciest options.
Derek W.
-
★★★★★
The turbo-related parts for my Supra came exactly as described and have held up great under boost. Zero complaints.
Javier S.
-
★★★★★
I appreciate that they stock real-deal brands for Supra builds instead of filling the catalog with questionable stuff.
Miguel R.
-
★★★★★
I'm picky about what goes on my MK4. J-Spec Garage earned my trust with accurate listings and solid communication.
Steven D.
-
★★★★★
I've had a great experience ordering Supra parts here—accurate listings, fair pricing, and quick shipping.
Marcus D.
-
★★★★★
It's refreshing to buy Supra parts from a shop that actually knows the platform.
Preston G.
-
★★★★★
The turbo and supporting parts I got for my Supra were exactly what I needed. Everything matched the listing.
Trevor M.
-
★★★★★
If you're building an RX-7 or Supra, this is a shop you want to know. RaceOnly parts for the rotary and quality Supra gear in one place is a win.
Victor H.
-
★★★★★
It didn't feel like I was buying from a generic online store. It felt like a shop built for enthusiasts.
Wyatt N.
-
★★★★★
Good communication, real brands, and parts that showed up when they said they would. Hard to beat that.
Zachary R.