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I've got the JB3 (running fairly conservative program #3) and dual intake on my 35i. I'm very happy with this combo and recommend it highly.
I love my 35i but was looking for a little more power given my former car was a M6. I was originally thinking to go with a future Dinan solution, but after reading all the positive reviews on the JB3 I decided not to wait. These simple mods really did the trick. Car performs significantly better, seems to run a little smoother, gas mileage is unaffected and sounds great (intakes). Even after the M6, the 35i with JB3 accelerates fast enough to put a smile on my face! Just be careful to run a conservative JB3 program to avoid over-torqueing and throwing service codes and to remove before taking your car to the dealer for service. Given the install is very easy/quick, the latter should not be a big issue. Enjoy!
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