The standard thermostat in the FG turbo has a 54mm flange a total height of 39mm and a flange to base height of 22mm, it is a 91C/195F temperature For those wishing alternatives just to make it easier I have Dayco part numbers that can be cross referenced for other temperature configurations. Std DT14B (91C/195F) step 1 DT14G (89C/192F) Step 2 DT14A (82C/180F) Step 3 DT14E (77C/170F) Step 4 DT14C (71C/160F) All these thermostats are identical except for temp ratings. These are listings and I take no responsibility for any consequences of running anything other than std equipment and you should consult a professional prior to fitment. Just for an idea of differences, the temp guage on the FG ran just nudging half way on the std thermostat and I went for the coldest one (71C) and it now runs just a hair over one quarter on the guage. A run out west today had it returning almost 1km/100L better than the last trip (same route) but will need to repeat the run a couple of times may be just coincidence. Only had the car 1 week and done 1500km already hope the novelty wears off before the car wears out.