I have had it in my 335i for a couple of weeks now, pushing the stock settings of +3.5lbs of boost. It definitely pulls harder but it's not crazy power like a JB4ed e9x. But for <$400 and 5 minute install = highly recommend. Mostly because I know it'll be a cheap upgrade to stage 2 down the road. I also picked up a can tool to clear codes but I have not needed to yet. I've put about 400 miles on it with no problems except my gas mileage went down to 16.5 for the last tank. I'm sure that has more with me being very heavy on the pedal & 100% city driving. Still better than the 14.5 i was getting in my e93. Go get it so Terry works faster on a stage 2!!!
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