i got the mw54 mk3 at first i had the thermocoup in to far 4mm as spec by wren but here in aussie with the different temps here it was too much as was reading temp to high therefore rpm would not go to full for a long time.. then had to open air intakes more to let more air in because eng taking to long to ramp up .. done all that flys great now.. oh foregot to mention i backed the thermo to only 1.5 mm