Quote:
Originally Posted by roundel335
I'd wait and see. Stacking tunes might be risky until it's known what the factory thing will produce. That, and Cobb might need to do some R&D since the F30 has a different DME than previous series.
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You can't "stack" tunes exactly. They really overwrite each other. Not like ppk gives you a 20hp increase, and cobb gives a 30hp, so both will give 50hp. Doesn't work like that as they're both (really simply put) are just increasing boost adjusting parameters.
They basically flash over each other so no real point in doing both. PPK will be a bit more conservative and probably cost more but give you the full BMW warranty while others will probably be more aggressive with less warranty (if any).