Everyone has their own opinions, but personally, I wouldn't mod the crank pulley. At the very most, I would only underdrive the accessories like the alternator...leave the crank alone. Just my $.02
As for CF, it is microscopic, but it does offer significant weight savings. I'm plannin on adding CF hood and trunk, as I stand to save nearly 100lbs by doing so. Coupled with other weight reduction mods, this will add up, and make the car quicker.
As for the 540MAF, doesn't make much difference. I can't tell you the differenc in ponies with and without, because I had custom software built by Active Autowerke to go along with the addition of the MAF and a CAI. When dynoed, it didn't show a big gain, just a more linear curve.
The reason I added it, was because it keeps one from bottlenecking the flow of air. I have a 3.5" CAI, and the stock MAF steps down to 3". This way I maintain consistent air flow all the way up to the throttle body, which I'm contemplating changing, and deleting the ASC alltogether.
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