Commercially Available Seven Speed Manual Transaxles

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I have an 03 MR2 Spyder that I use strictly as a form of transportation. With winter upon me (not good convertible weather in the Northeast) its time to put this guy in the garage and increase my spring-time driving satisfaction. I will be making only two changes to the vehicle. The installation of a super-charging kit (model TBD) and replacement of the 5-speed manual transaxle with something that has more gear(s). A little extra kick from the engine would be nice, although I won