Thanks for the replies guys, I'm not exactly OEM as I bought the becker "aftermarket" It's model number is 6810 and I've seen the OEM quoted as 6811, also all the buttons are black with the brushed silver for the face plate. The (full) manual it came with quotes it as a DTM High Speed and says it will accept a Silverstone CD changer or Aux input, I've read somewhere that this is the required specs/minimum for Desions units, so maybe the Dension quoted merc or Renault (both becker oem I believe) may do the job but I really don't want to "put my money where my mouth is" and fail if someone's already done it.

(Anyone struggled with NavTeq/TMC on beckers in the UK yet)?

As far as the spoiler deploy is concerned I have replaced the 3000 evo and checked its and all the other associated wiring four times. Perhaps if someone knows what signal/wiring deploys the spoiler I may be in with a chance of sorting it. Forgot to say this only occurs when the car is in motion, if the car is started and stationary it doesn't happen so I assume there must be some form of speed sense that is being interfered with.

As you are experienced and knowledgeable with the crossfires have you come across anyone having issues with the engine cutting momentarily when depressing the clutch for a gear change.

And lastly (honest), I have what appears to be some form of pre-ignition (or sounds like) at lower revs 1,500 - 2,500 in second and third gears.

Help with any of the above would be greatly appreciated. I may seem overly fussy but my Crossfire has only got 2,000 miles on it and I'm obsessively particular when it comes to my cars (X-fire and X5, must be an X thing)!

Thanks again.