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I had this same question and I asked Terry directly. There is no doubt that you are going to take a few years off the life of car by adding boost (especially to 15psi). But we are talking about very long term effects. (I think a 335 owner is at 56k miles running 15psi daily) My suggestion, if your going to keep the car in excess of 70,000 miles is to run the low boost map while daily driving.
I also asked Terry about the turbo issues and he stated that his tuning of the boost is similar to what Dinan does as far as tapering boost to preserve the life of the turbo's.
If you want to be conservative and extra safe you can go with the JB1 or JB2 and then always upgrade if you want more power.
If your going to own up to a $15,000+ dollar repair bill, I would just keep your car stock like me. Hahaha.
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