Mr.Squeeze

SRM does not stop working when you switch out the rear diff, I have changed my final drive to a 3.357 ,and mine works fine I use it all the time. Now granted it might be off a few hundred rpm give or take.

Jon when you took a ride in my car I was using it , It still might be something you can look into with the software for fine tuning it down the line.

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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ