Welcome to the forum mate,

I don't think that there will be a lot of difference, its just an antenna, the GPS receiver as such is build into the MK3 and Mk4 Sat Nav drives so any antenna will do.

Others may know better, but I'd say, give it a go, if its no good you can always get a pukka one.

If you can get the MK4 dvd drive, as its a much better unit than the older ones. If you have (or get) a mk4 have a look at this page for a upgraded map disc.

http://www.xoutpost.com/navigation-sy...db-update.html

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.