what are the differences between the two cars/engines? they both carry the same engine codes EW10J4/EW10JP4 but the only difference i know of is that one from the XSi has 140bhp and the Feline has 180bhp. obviously the feline is the facelift model and possibly has a few added extras compared to the XSi but what is different to give the engine an extra 40bhp? ive heard that its just the ecu? can someone confirm this or tell me the actual differences?