[Pro Stock John]

Originally Posted by Higgs Boson

remember, custom operating system is different than a custom tune. it costs even more to change the OS completely, and it can't be done on every car. for example, there is not one available yet for my car, the specific OS from the factory in my 2012 SS must be re-engineered. there are more than one factory OS in the E38s or any other ECM, per model year. so it can take a while to get a custom OS, and you have to request it. so it is best to check if it is available and then "order it" so to speak w/HPtuners or whoever you use.

if you are sitting in the staging lanes, turn car off, hood up and push it! this is where an electric water pump or manual control of your fans is great. you can turn them on while the engine is off. this will help your ECTs but also your IATs.

~Yep I know the difference, I just have a tune. I'm not interested in a custom operating system no hurry to mod up this car that much.

~My fan settings are working pretty good, I had them set up so I would not have to push the car which is hard for one person . As for the other stuff, maybe some day a fan switch but it's working good. But the 160 stat could be interesting to do in the future, thanks for the real-life experience sharing.