PRODUCT DETAILS
Driveshaft Shop X4 700HP Axle Set - 2002-2006 Acura RSX Type-S (510397 / 510189)
This is the axle for a fast street car that still shows up at the track. Driveshaft Shop's X4 line is built from 300M with their best heat treat processes, rated to handle 700 to 1000 wheel horsepower depending on application, and it's a direct bolt-in. If you've outgrown budget axles but don't need a full hub kit, this is the tier that stops axles being the weak link.
300M Is Why It Holds
The material is the reason for the rating, and it's a genuinely different tier from what ordinary axles use.
300M is a high-strength alloy used where failure isn't an acceptable outcome. Combined with Driveshaft Shop's heat treat processes, it's what lets these handle the torque and shock loading that destroys lesser axles on a hard launch.
Axles typically fail in torsion rather than bending, so material strength through the bar is what determines whether one survives a sticky tire and a built engine. That's where the 700 to 1000 wheel horsepower range comes from.
Built For Cars That Do Both
Worth understanding the positioning, because it's specific.
Driveshaft Shop engineered the X4 line for fast street cars that visit the track for drag, road course, and autocross duty. That's a demanding category, since the axle sees daily driving loads, launch shock, and sustained cornering load all in the same week.
On a DC5 Type-S that's a common profile. These cars get driven, get tracked, and get built, and the X4 is sized for exactly that life.
Where This Sits In The Range
Three tiers, and the choice comes down to power and whether you need hubs.
Level 0 is stock replacement and basic swaps. No horsepower rating, no warranty against breakage, and the right call for a car that isn't making serious power.
X4 is this set. Real rating, one year warranty, direct bolt-in to your existing hubs. The step for a fast street and track car.
1000HP kit is the top, and it includes hubs because it requires its own. That's for the hardcore racer at 900 to 1000 wheel horsepower.
Most people building a quick DC5 land here, and it's usually the right answer.
Direct Bolt-In
No hub change, no modification, no adapting anything. These go in where your factory axles came out, which keeps the job straightforward and keeps the cost to axles rather than an entire package.
Previously RA4008X4 / RA4009X4
Worth noting if you're cross-referencing. Driveshaft Shop renumbered these, so the old RA4008X4 and RA4009X4 part numbers refer to this same product. If you've seen them listed that way elsewhere, you're looking at the same axles.
Non-Refundable After Installation
Worth stating clearly. Once installed these can't be returned, which is standard for driveline components at this level. Confirm your application before you order rather than after.
Check Your Range Of Motion After Install
Once fitted, cycle the suspension through full travel and turn to full lock both directions. You're checking that the inner joint isn't bottoming out at compression or over-extending at droop, and that everything clears through the steering range.
On a lowered car this matters more than it would on stock height, since the axle is working through angles Honda didn't plan for.
Fitment
2002-2006 Acura RSX Type-S (DC5)
Part number 510397 / 510189, previously RA4008X4 / RA4009X4. Sold as a pair.
Who Should Run These
This is for the Type-S owner whose car is genuinely fast and still gets driven, and who's decided axles shouldn't be what limits it. Real power on the street, track days on the weekend, and a set that won't be the thing that ends your day. Bolt them in, check your travel, and go use the car.
Fits: 2002-2006 Acura RSX Type-S. Part number: 510397 / 510189 (previously RA4008X4 / RA4009X4). Rating: 700 to 1000 wheel horsepower depending on application. Material: 300M bar and splined stub, chromoly CV housing. Includes: axle pair. Warranty: 1 year. Note: non-refundable after installation.
2002-2006 Acura RSX Type S