Hahaha. Um. Give me your car and I'll give you my 2002tii. After a weeks worth of driving, you'll get your car back and then you'll realize how much power is in my car! jk
Seriously, if you are thinking of putting that much money into your 540i, go buy an M5. Less headache and the car is already silly fast.
Then supercharge it!!
hmm...new 540i...unless you know a good mechanic who would know your car intimately. I would avoid the high compression pistions/rings, titanium value springs, hot cams, ported/flowed intake, etc. Or just bring it down to Dinan.
Sorry WRX folks...Matt and I are having a BMW chat. We'll take it offline so we don't corrupt your minds and wallets