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Is the Bimmerworld Stage 2 a plug and play option (i.e. they send an entirely new DME ready to install)? Is there such a thing? If not, can you get a used DME, flash it to your car, and then flash it with a tune in order to be able to reinstall the OE DME to put everything back to stock? I'd like to be able to squeeze out a little more performance but not have to worry about not passing smog checks and Bimmerworld is the only one I can find that offers a tune specifically for the N51. I was hoping to find something here about that, but either I'm terrible at search or there's nothing that exactly fits what I'm looking for.
My latest E9x is a 2011 328i E93 SULEV (aka N51).
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