Why do people recommend map 1 over 2 on a JB4
My 335i is 100% stock other than the JB4 and running 93 octane. The guy who installed it put it at map 2 and said that is where I would want it. But after reading on here that it is too aggressive for a stock car? And that I should be running map 1? Is this true?
If so why is it that you can get a DCI, intercooler and downpipes and then the map 2 is ok?