I know BMS makes the Sport Oil Cooler valve: http://www.burgertuning.com/sport_oil_cooler_valve.html I'm pretty sure this valve is simply a bypass so your oil is being cooled all the time. This can't be optimal for those who live in a cold climate or want to get up to operating temperature quickly. Perhaps @[email protected] could give insight on this piece. I'm worried an aftermarket oil cooling circuit like the ER may further prolong a warmup, even if it is only by a few minutes. And RB makes the block off plate: http://www.rbturbo.com/products/accessories/rbocdelete This seems to do functionally the same thing, but looks more appealing to those who intend to run a completely external cooling circuit which may also include their own thermostat. And AD-E makes their low temp thermostat: http://www.ad-eng.net/store/p19/BMW_N54_N55_Low_Temp_Oil_Thermostat.html The @AD-ENG thermostat looks to be the only one which is still a thermostat within the stock housing. Apparently it opens at 180F. Is there any good reason to go with the BMS bypass valve over this thermostat if you aren't on a road course?