have u guys heard of stromberg b4?a salesman told me that the device gives better torque and fuel consumption. showed me a test : the result is that-1. w/o stromberg, the fire at the spark plug was blue + orange;2. with stromberg, the fire at the sparks plug was pure blue ; he said it means that the fuel would be burn almost completely, thus more power, better FC, long lasting spark plug.what say u guys? have any one tried on their bmws?