[gixxerboy63]

I'm currently running;
Pure stg2 Turbos, RK intakes, Active Autowerkes DPs, Full Akra titanium exhaust and Active Autowerke custom tune...
Active has upgraded my tune several times as I have added upgrades or components.

I am still running stock manifolds... read somewhere that someone had swapped in M5 manifolds and headers, yet reported a loss in power; (M5james would know who this person is)

Last dyno result on 8/15/17 We are planning on another dyno session to dial it in further, but honestly don't expect more than another 50 hp at most with current mods.
685.7hp and 707.9ft-lbs which translates to 596.3hp and 615.6ft-lbs at the wheels.

....So this rabbit hole has cost me somewhere in the neighborhood of $16k in upgraded engine performance parts alone (Most were acquired at somewhere less than retail:my Akra titanium exhaust was actually purchased at 50% off retail!), so based on average 444hp stock to 596hp modified has been roughly $100 per 1 horsepower! Yeah, it's cool to have a fast SUV, but it is STILL 5300lbs that the added horsepower has to overcome to propel this thing down the road! Your money will be better spent on a platform that has more R&D (read; cheaper cost per HP gained) My AA tune only M4 ($1500) will likely bust the X5M's can anywhere it pleases...

Again, It's really cool to have one of the fastest X5Ms around, but if I had it all to do over again, I would have been happy with just a tune (Still very quick and would have saved myself $15k!)