We offer both types.
If you plan on going with methanol injection go with the JB4 + BMS kit.
Jb4 has a lot of really nice features that you cannot get using flash tune.
If you want no hardware install and smoother power delivery, go with the flash tune.
Active OBD flash is my first pick for a strong reliable off the shelf map
BM3 would be my option if you are looking to fine tune the car with custom maps
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