CarBahn calls its G82 M4 mods its Signature package, and it retails for $20,599. There are some more CarBahn options on this particular test car that add another $9,000 to the price, in addition to ...
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Tested: CarBahn CB3 BMW M4 Competition Is a Bona Fide DinanAdd the same kit to a 543-hp BMW M3 CS or any S58 inline-six, and the result is again 735 horses since the hardware is all the same. We sampled this extra thrust in Dinan's tuned-up BMW M4 ...
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