Well I spoke with Raj from Beisan Systems a few moments ago and he has some very interesting things to say about the S54 Vanos.
Basically from what I gathered there was an earlier BMW euro engine design that had the general "Exhaust Tab" clearance set lower than the current S54 that uses the exact same setup minus the difference in clearance. The S54 tab clearance is higher which appears to cause more rattle and risks failure of these tabs. Raj is developing a sleeve kit to solve this and should be released soon.
In addition the bolts on the Intake side I believe are a common issue with rattling loose.
The solenoid failure is also another issue.
I believe he said the seals aren't the biggest issue but may as well replace them while we're in there.
From what I can summarize, a rattle kit, seal kit, solenoid kit, and some thread-locker on the the bolts for exhaust/intake sides is probably the best solution. I've linked this thread in an email to Raj so he can hopefully comment on it and reduce the amount of phone calls he gets as he's just in the process of finishing this up atm for product release.
And from what I can gather at a significantly lower cost than the Dr.Vanos kit which from what others have said is extremely overpriced for a basically stock OEM unit that has just been cleaned and could possibly yield the "Ticking timebomb" effect later.
Last edited by Commanderwiggin; 09-22-2011 at 04:17 PM.