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Brothers Performance offers performance manual transmissions from Ford Racing and Tremec. Tremec heavy duty Ford manual transmissions are designed for high horsepower applications. If you are making 400 plus horsepower, chances are you will need to upgrade your Mustangs manual transmission before you leave it in pieces on the highway or race track. Take a look at the Tremec TKO 500 or 600 race series Mustang manual transmissions. For mild performance builds, or just to replace an old worn out stock T5, consider the Ford Racing Cobra spec T5 (aka T5Z).