Originally Posted by JJJames
Also - fuel door swings open while driving - any idea how I'd fix this?
lock your doors from the inside while you're driving and it wont swing, otherwise change the "C" looking spring on the fuel door. The 540 is pretty dead for more serious tuning than what you have listed. It's quiet expensive to do forced induction on it.
1990 M5 Euro
You wash your car like it was your firstborn child, you tend to its needs like it was your own body, you protect it like it's your family, then you drive it like you stole it