take note that oil coolers will cause ur oil pressure to drop. one reason why i havent installed one yet even though im planning on tracking as much as possible this year.
some oil coolers come with thermostat to prevent oil pressure drop, but itll still drop once the thermostat opens...although not that long..upgrading oil pump is also an option. and oil coolers with thermostats are expensive... theres the M7 for sale here in this forum oso going about 1.5-1.7k iinm....ive found used oso around 800.