I figured I would post this up, just in case anyone was interested in seeing it. I can't wait to see how the next analysis looks at 5k miles, since I am now running Castrol Syntec Euro Formula 0W-30 (German Castrol).
Originally Posted By: Hammer
Originally Posted By: SteveSRT8
all single turbo now except the 335is still runs twins.
same power, same specs.
Not quite...20 more HP and a slight bit more torque for the "IS". That same engine in the Z4 makes 35 more HP.
Information is on the BMW website.
In reference to his question my answer was correct.
Taken out of context I was wrong. And note that the 'overboost' setup on the IS model is a temporary increase that only runs for a few seconds, then you go back to the standard output.