Don't take it personal. Maybe you aren't aware of this, but BMS and any other company can be held liable if they are selling a product for street cars that is illegal in many states for street cars. It makes perfect sense that he's being tight lipped and sticking to his guns that this is for offroad use only. It also sounds like you haven't dealt with BMS much; it's widely accepted that Terry and his team provide the best customer service among our vendors. They are the gold standard. In this case it sounds like communication broke down between your frustration to not get the answer you wanted. Don't be so quick to bash people, either.
2007 SGM E90 335i
JB4, Mr.5 Intake, BMS C@tless DP's, ER Sport Oil Cooler, Cyba Scoops and Quad Tips