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the only reason why billy uses the 160 on race day is b.c doing full throttle full boost over and over will eventually heat up, but it keeps it cool. but go with the 180.
dont go any lower than 180 cause like i said before you wont completely reach correct operating temperature. i have the stock 195 and live in colorado and drive the canyons here all the time and i have never come close to overheating