Terry....the 4/4 has a piggyback ecu to remap the original Ford one, to take into account the lighter weight of the car etc. so there may be some power gains. I'm tempted to get mine on a dyno as it stands now out of curiosity!
Cain....a pair of 40 DCOE's would be VERY tempting but how they would fit in with the ECUs etc could be a problem and then there is the emissions issue at MOT time. Your approach of getting the engine to breath better is not a bad approach.
