Ultra Racing 2-point rear torsion / rear frame brace for Mazda MX-5 MK1 / NA models listed in the compatibility table.
The Ultra Racing RT2-408 is a rear torsion bar / rear frame brace designed as an aftermarket chassis reinforcement upgrade for the first-generation Mazda MX-5 NA.
Mounted across the rear lower chassis structure, this two-point brace links key mounting areas to help reduce unwanted flex and movement through the rear of the vehicle. Reinforcing this area can help the suspension and chassis respond more consistently during cornering and changing loads.
Product details:
- Brand: Ultra Racing
- Part number: RT2-408
- Product type: Rear Torsion Bar / Rear Frame Brace
- Position: Rear lower chassis
- Brace specification: 2 Point
- Material: Mild steel
- Construction: Hollow steel tube with welded mounting brackets
- Finish: Ultra Racing white
- Quantity required per vehicle: 1
- Quantity supplied: 1 rear torsion brace
- Original vehicle nuts / bolts are reused where applicable unless additional hardware is supplied
Common reasons for fitting:
- Reduce unwanted flex through the rear chassis structure
- Reinforce key rear lower mounting areas
- Help improve chassis consistency during cornering
- Improve rear chassis response during enthusiastic road or track driving
- Complement front, middle and rear Ultra Racing chassis reinforcement components
Fitment advice:
Ultra Racing manufacturer application data confirms RT2-408 for the Mazda MX-5 MK1 / NA platform. Some aftermarket catalogues also list the part for later NB models, but the strongest manufacturer source located specifies the NA application, so this listing is intentionally limited to that generation. For imported, modified or previously repaired cars, matching the mounting arrangement on the vehicle before installation is recommended.
Other items to consider purchasing:
- Ultra Racing front strut brace
- Ultra Racing front lower brace
- Ultra Racing middle lower brace
- Ultra Racing rear upper brace
- Ultra Racing anti-roll bars
- Replacement chassis fasteners where existing hardware shows corrosion or damage
Useful tools / consumables:
- Socket and ratchet set
- Torque wrench
- Suitable vehicle lift or axle stands
- Penetrating fluid where existing underbody fasteners are corroded
Difficulty guide: Intermediate DIY / workshop installation. Safe access beneath the rear of the vehicle is required.
Why Ultra Racing?
Ultra Racing specialises in aftermarket chassis and handling upgrades. Its chassis braces use vehicle-specific steel structures designed to reinforce key mounting areas and reduce unwanted chassis movement under load.
What's in the box:
- 1 x Ultra Racing RT2-408 2-point rear torsion brace
- Additional mounting hardware where supplied with the product
Installation notes:
The vehicle must be safely raised to provide access to the rear mounting points. Position the brace correctly before final tightening and check clearance around suspension, exhaust and surrounding underbody components. Reassemble and tighten all mounting hardware to the appropriate vehicle or manufacturer specification.
| Make | Model | Sub Variant | Chassis / Code | Years | Power (PS) | Engine Codes | Fuel | Transmission | Notes |
|---|---|---|---|---|---|---|---|---|---|
| Mazda | MX-5 MK1 / NA | 1.6 | NA6C | 1990-1993 | 115 | B6ZE | Petrol | Manual / Automatic where fitted | 2-point rear torsion / rear frame brace. |
| Mazda | MX-5 MK1 / NA | 1.6 | NA6C | 1994-1998 | 90 | B6ZE | Petrol | Manual | 2-point rear torsion / rear frame brace. |
| Mazda | MX-5 MK1 / NA | 1.8 | NA8C | 1994-1998 | 130 | BP-ZE | Petrol | Manual / Automatic where fitted | 2-point rear torsion / rear frame brace. |
| Reference Type | Reference Number | Notes |
|---|---|---|
| Mazda OE | N/A | No direct Mazda OE reference - aftermarket chassis reinforcement part |