You might hear the question is the S58 G87 M2 better than the B58 M240i or is it the other way around? Here is one tuner’s take on the issue. The S58 car is more expensive, but for the price difference, the B58 car can be fitted with fuel system and turbo upgrades. One thing…

Most people use pump fuel most of the time and quality can be a problem. For that reason, pump gas maps from JMT Calibration come with multiple revisions or multimaps as standard to counter the bad fuel and give you options. Dealing with timing corrections is a fact of life for tuning with pump fuel.…