Tuning Z4 3.0i

[Herb Cold]

who has experience with tuning the E85 3.0i, 2003? did find a german Company (bhp-motorsport, located Stuttgard). they offer a chiptuning to 254 HP for € 459,-, totaly safe and for long term running without any problems. Is there someone who did it and how was the experience and result. Thanx for reactions......