OK so there are 3 differnt 91 oct tunes on there. The Performance 91 (thats for the non-plastic intake) The Racer 91 The Trans and Racer 91 What the hell is the differnce between the last two ..??
I'm guessing the last one is designed for automatic transmissions to firm up shifting. On my DiabloSport tuner it was called their "firm shifting" tune and required 93 Octane. There was also another 93 Octane tune that didn't firm up the shifts.