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I went with a Stage II on mine right after the break-in period. If I were still the heavy modding type, I would still have started here. As for me, this is as far as I'll go with this car. It's a lease so it's bye-bye 7/2019. Since your car is under warranty, I would stick with Dinan upgrades as far as the engine is concerned. Suspension, do whatever you want. I've never had dealer warranty issues across three German marques with good suspensions mods. You're in SoCal, there's more than a few Dinan BMW dealers (as well as indy ones) in the OC\LA area. I would recommend, since you're under warranty, getting the flash done at an actual BMW dealership that is a Dinan shop.
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