Originally Posted by Martin-Hadland

Worthwhile swap, you can simply replace the pins on the loom you have already but you may have to add some extra wiring as there's loads of extra features you may wish to use, I've just done this on my 500. The ECU new is £845 plus vat, you need to be careful that it has the right drivers for what you want though but even if it's the wrong spec it can be sorted cheaply.

You will be able to run coil on plug, 8 inj, launch control etc etc. You will also be able to control your cooling fans with the ecu too.