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I have MPPSK and the first thing I did was JB4. It's the smartest thing to do because you can start logging and learn how the car behaves and reacts to different things. I'm also partial to the JB4 because I put 120,000 miles on my last one with my N54.
Forget the JB+ on the MPPSK. It WILL drive worse, and without logging you won't understand why.
I also have a BMS intake and meth kit, but that came after many months of logging and learning how this engine worked.
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