Mazda had designed the Dynamic Tracking Stabilizing System(DTSS) into the rear suspension of all the FC3S to prevent hideous oversteer under severe cornering.  Although a very good concept for mass consumers, racers can't stand DTSS under demanding conditions.

Racing Beat makes a "Rear Suspension Upright Toe Eliminator" bushing (part number 14050, US$40.00 for the pair) that replaces the stock, rubber DTSS bushings with Delrin bushings.  After install, the rear is more predictable under heavy cornering.

The Mazdatrix website has an excellent write-up on the whole procedure.
Click here to go to the Mazdatrix section on the DTSS bushings

Racing Beat - Rear Suspension Upright Toe Eliminator - PN 14050

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