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Originally Posted by Raikkonen
I still find this increase to be unusually large considering the fact that it's a normally aspirated engine, and almost identical in design to its sibling. Even when taken into account the changes in intake, exhaust, and ECU, the increase seems more than merely substantial. I say this because similar Dinan modifactions on the previous generation 3 series only yielded about 15hp, and that was including intake (albeit simply a cold-air system), exhaust, and ECU.
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What so unusual?
The 330's intake is NOT just a cold-air intake, its a variable intake which adjusts according to engine speed. It comes with some type of adjusters that allow it to do so, which have specific part numbers attached to them(from BMW). In addition to these unique parts, the intake manifold is a completely different part number on the 330 than it is on the 325. And incidentally, the exhaust parts are all the same.
Hard to believe in this case, but yes, its pretty much all about the intake. As far as reprogramming the ECU, any tuner will tell you that without some type of physical modification added to it, you're wasting your time. This comes straight from guys like Steve Dinan. The guys at Dinan say it'll be at least a year before anything becomes available for these engines. Whether or not they can do anything very measurable remains to be seen, especially since the 325's manual transmission is not rated for much more than 10 or so extra horsepower.