Wallet pain but no gain. For stock & light mods BMW's are pretty well engineered right out of the factory. Personally I would have to wonder what if anything they can add when the intakes are in a high pressure area to start with.

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Kevin

2013 BMW 135is 6spd conv - 2011 BMW 335is Coupe JB4/ISO
2010 BMW X3 - 2009 Ford Expedition 4X4 EL - 2009 V-Star
2003 Nissan Xterra 4X4 - 1998 Ford Ranger 4X4 Splash