Not in El Paso anymore, but me and my e92 are in Dallas (eurotuner OCT issue)....unfortunately there are not many (if any) tuners in El Paso for BMWs, let alone e92s. If you are going to invest in some serious mods, travel to LA or Houston for a good tune. As far as bolt on stuff, Evolution Racing has experience with testing and installing your typical mods talked about on this forum. Joe at BMW also has some good insight, but he lives with the constraints of BMW USA. If you want transmission, suspension, and a light tune, go see Gerd....he has a shop by Border Patrol on Montana. Gerd has an extensive knowledge of European cars....charged me 1/4 of the price I was quoted from BMW to replace my clutch.
As far as audio, interior, or exterior...PM me and I will give you a good contact