I don't know why I am getting involved in the "discussion." I guess I just have nothing better to do while sitting at work . That being said it amazes me at the ignorance present in this thread. Several post on this thread come from 1st time posters that joined this month, and are very actively defending the BMS JBD....coincidence, I think not. I am not bashing the product by any means, but if someone is worried about longevity and reliability they should stay away from ANY tune not just the JBD. Aiden has provided some good first hand technical knowledge (however generalized you want to say it is). Whether you agree with him or not, unless you have evidence to prove otherwise, take what he has said for what it is…his professional opinion based on experience. I am no expert on tunes and do not claim to be, however the JBD is essentially a variable resistor with an algorithm which does fool the ECU to increase the fuel delivery (as Terry stated himself) to increase the power. Yes it is effective as the 200+ users of it will attest to, but the potential damage to the motor and driveline components is not yet known. If you are okay with taking the gamble, then by all means purchase it and be happy with your decision. I have no doubt you’ll experience increased performance as with all BMS products. Personally I prefer another company for tunes, but they haven’t released a Diesel tune yet and I’m not sure if they plan on it. As far as Kloogy and any of the other users bashing others post without offering any technical information to prove otherwise, you’re wasting everyone’s time on here. Bashing someone else when you have nothing to counter with and provide something the OP can benefit from is a waste of everyone's time following this thread. Grow up a little and stop whining when you aren’t technical educated enough to offer any useful information towards to thread. It’s real easy to sit back and complain about how wrong someone is, especially when you can’t articulate why they are incorrect. Ok I’m off my soapbox now and maybe will leave room for someone much smarter than me to offer something constructive to the OP. No I have to try to do something productive enough at work to feel like I've earned my paycheck today.

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'12 E92 M3 ZCP Stage 2 Tune, Exhaust, Test pipes, GTS DCT Software
'07 E70 4.8i
'07 E92 335i FBO+Meth M3 Suspension Swap and much more 505hp 564 lb/ft tq (Sold)
'89 E30 325i (Retired with 230,000 miles )