How to improve clutch action on your 540i six speed for 5 dollars?
There is a clutch delay valve inline between the clutch slave cylinder and the hydraulic fuel line that feeds it. Its purpose is to delay clutch function to guard against drivetrain damage that may occur during "hole shot" starts. It also makes the clutch feel weird and un-BMW-like. Remove the valve, take it outside, and throw it as far as you can. Thread the hydraulic line fitting directly into the slave cylinder to improve clutch action. You'll have to bleed the system; the five dollars is for brake fluid. Avoid John Force style hole shots from then on.