Deliver in early/mid May???? Your car must have been shipped in Aus already. Otherwise the wait would be 4-5 months. I ordered my TDI125 in Mid Feb and delivery will be in end May / early June. R36 even longer (6 months +). You're lucky

Vene is right, why would you have optioned the RNS510 if you are planning to go for the after market system. You would have to pull out the RNS unit in order to do it. I don't get it mate.