[LarryHughes]

I'm curious - why are you going to a low temp thermostat?
If you're under the impression that it will lower the running temperature of the coolant, you may be wrong.
I was considering putting a low temp thermostat in my '01 996 which is in good condition and stock.
But I was curious to see how much the temp would fall. As an experiment, I removed the stock thermostat which has the engine running at an indicated 185F. Without any thermostat? Yup, an indicated 185F.
It turns out that the thermostat is usually only for warming the engine more quickly and is NOT the limiting factor of temp. The capacity of the cooling system is the limiting factor.
May save yourself a lot of time and trouble by trying this test on your vehicle before popping big $$ for a low temp thermostat.