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The RoadsterSport PPF brace is designed to reduce slop in the transmission by bracing the PPF against the rear subframe. This brace also improves traction by reducing wheel hop, a must for boosted applications. These braces are made in the USA from ultra light honeycomb aluminum for maximum strength and powder coated to last a lifetime.
Brian's Application Notes: Fits USDM Miata NA8 94-97 or on NA6 Miatas with rear NA8 arms. Great mod for race cars, but for street cars, notice that you will pick up more gear whine because this item works by taking away much of the isolation effects of the bushings on the factory power plant frame.