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Sub Frame

Subaru Impreza 1993-2007 Lightweight 4310 Sub Frame 1" drop

$2,150.00


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Impreza Rear Subframe

A major problem when lowering a vehicles center of gravity is that most teams do not consider how this affects the factory wheel geometry and roll centers.

A change in the vehicles ride height can drastically affect the path a wheel will take through the range of suspension travel. Camber and toe can vary to point that the car goes from over-steer, to under-steer characteristics in a mere 3mm of wheel travel.

MSI has addressed this handling issue with all Subaru Impreza's that use McPherson struts in the rear by developing a rear Subframe that corrects suspension geometry on lowered vehicles (up to 1” with factory fuel tanks in place on our standard units.)

Our Subframe is manufactured using the latest technology in CNC Tub cutting as well as mandrel bending. Each unit coming off the production line is assembled in a heavy duty jig, and is then verified in a separate jig after stress relief is completed over a 24 hour cool down period.

Each frame comes with installation studs that automatically centers the frame on each chassis using tapered fittings, as well as bearings for the differential installation. As an added benefit to correct wheel geometry, our unique design will eliminate significant amounts of chassis flex in the rear end, differential knocking under hard acceleration or shifts, as well as variances in wheel alignments due to bushings changing location, flex, or deformation.

Our tubular Subaru Subframe assemblies will benefit any street or race car with coil-over suspension systems. The MSI Subframe is lighter than the factory assembly by 50%, while increasing the rigidity and consistency of the rear suspension system beyond what is commonly scene in the North American marketplace. Average weight (depending on options) is about 15 lbs compared to the 30 lbs of an OEM unit.

Originally we manufactured two versions of this frame, one in DOM and one in 4130. Due to the extreme popularity of the high end versions with professional teams worldwide, our increased production volumes have permitted MSI to reduce the cost of these lightweight 4130 versions to make them very affordable for standard street and track users. The DOM MIG welded version is no longer in production as the cost savings was minimal when compared to the gains acquired with the 4130 version. However, for pure Motorsport or off-road usage, there are a few extra brackets and options available to increase torsional resistance, as well as custom geometry options available as well.

Final development on a new motorsport version using a billet differential mount designed to be able to exchange rear ends in less than 4 minutes is due to be released in the summer of 2010. A rear Subframe for the 2008 and newer GR Subaru Impreza chassis is currently being developed, with initial assemblies already being fitted onto the first few vehicles.

Custom applications and options available upon request, so please do not hesitate to inquire.

International Orders are GST exempt.



  • Model: MSIsub05-00-002
  • Shipping Weight: 31kg
  • Manufactured by: MSI




This product was added to our catalog on Wednesday 17 November, 2010.

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