Flashing ecu with 3.4 map (tune)

[jimk04]

So I have read on here and other places about when modding the 3.2 with better intake and exhaust that a good way to exploit the extra breathing and maintain good A/F is to flash the ECU with the 3.4 X51 map.

I spoke to a very knowledgeable indy today (in the UK here) and he sais it cant be done due to the VIN numbers in the ECU and the alarm module....if you flash in a 3.4 tune you would need to provide a VIN from a 3.4 car and then the VINs would clash and the car wouldnt start...

Any input, as I though from what I'd read on here it was common practice with you guys?

Thanks