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I can vouch for BR performance.
I have been running with a stage3 tune from them in over a year.
And it is by far the best tune I have had on this car with all the mods I have(Wagner FMIC, hybrid turbo, DPF delete)
They know what they are doing!
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Brgds
Allan
‘15 F36 435xd Gran Coupé
Ex: E46 330d, E91 330dA
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