No my Rotrex 1.5 upgrade is the same stg1 sc C38-81 with just a larger housing. The larger Rotrex unit will likely not fit with the stg1 configuration. You could still always use a smaller pulley for more power on your current setup.
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Eibach, Tanabe, Blitz, Vertini, GTM stage 1.5 SC, Aquamist, Invidia, Alto built 5AT, Edge Racing, Racelogic, GTM driveshaft, 440 whp in 101F TX heat..
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