RX8 LSx Mounting Kit In Stock!



When Mazda released the RX8 it was hailed for its perfect balance and handling. The power plant however was never fully adopted and plagued with reliability issues. So we set out with the goal in mind to retain what was so loved, and answer the long-desired quest for power. We based the kit around the late model LSx series. To mount the engine we developed an all-new tubular subframe, with integrated sway bar mounts to work with the CTSV accessory drive system and allows the use of the GM F-body oil pan without modification. The electric steering rack is swapped to a hydraulic Mazda MX5 version and helps shed 35lbs from the front of the car while mates to the GM pump. The transmission mount section uses a pair of CNC profiled uni-body supports which strengthen and provide the mounting areas for the transmission cross member. The PPF is removed and the differential is replaced with our driveline kit based around the Ford 8.8.

Mounting kit includes:

  • Tubular front subframe with built-in sway bar mounts
  • Lightweight engine plates with Energy polyurethane mounts
  • Laser-cut and CNC profile uni-body supports
  • Double arch transmission cross member for 3" dual exhaust Energy polyurethane mount
  • Necessary hardware to install grade 8 zinc finished with proper fasteners
  • Dark gray gloss powder coat.

Mounting kits are built to order. Lead times vary and it is best to contact us for the current lead time.


Additional information

Weight 80 lbs
Dimensions 12 × 36 × 28 in

Customer Reviews

Based on 1 review
Nathan H.
Worth the wait! Excellent fit and finish!

Ive been planning on doing this swap for almost a decade and this cradle was what attracted me to the idea. After finally getting my hands on a shell and drivetrain I pieced together my swap components based around this subframe. You get no install instructions but its fairly straight forward and fit without much trouble. You will need to reuse all factory cam hardware so save or order replacements if yours like mine got damaged in removal. Good luck finding a CTSV Power Steering Pulley or Reservoir since they are no long produced in either OEM or Aftermarket. Other acc kits may interfere with sway bar. Also trim the rear most(firewall end) 6" of frame "lip" to help with clearance for the heads, plug wire and exhaust manifold bolt. The transmission brace does have a long end and a short end so note that. Overall this is the best option on the market to mount a LS based engine in an RX8.