Hmmm. A tuner sold a tune that claimed more hp and it didn't actually produce more hp? And K&N filters didn't improve the breathing and result in more hp? Next thing you know, somebody will be wrong on the internet.

Suggest you name the tuner to protect other potential purchasers.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue