Last time we checked in with RaceChip, the firm was merrily wringing an additional 53hp out of the Alpine A110. This week, its man bun-obsessed workforce is clearly delighted to have been working on a BMW engine - specifically the latest B58 six-pot powering the Z4 M40i. A dyno test of the standard car reveals 351hp and 380lb ft of torque (slightly more than is claimed by BMW); post tune, it delivers 403hp and 456lb ft.
Clearly the brand is already familiar with the B58 - describing it as 'a perfect engine to tune' even in its new, emission satisfying guise. The result, highlighted on film with a slightly less than scientific blitz up the autobahn, produces a 62mph to 124mph time of 9.64 seconds - a 2.2 second advantage over stock, and according to RaceChip's own top ten, just barely slower than a modified Porsche Panamera 4S Diesel.
Given that car's accelerative abilities out of the box, the Z4's newfound outside lane prowess is clearly impressive. It would obviously be nice to see a more a rounded comparison of performance figures, but we'll forgive the Germans their obsession with indicator-on overtaking manoeuvres. As with the Alpine, the new M40i maps are already available in the UK, with the most expensive GTS Black pack currently priced at a discounted £499.