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Oh- well due to the charcoal filter, you may well see a noticable improvement. I'd probably go with an aftermarket paper filter with no charcoal layer instead though (e.g. NAPA gold). That engine is too damn expensive to let extra dust in for little to no gain.
CAT1212: without some sort of SAE industry-standard testing, claims are just claims. There probably was a time these things did make a big difference, but the engineering going into a performance-oriented OEM car is pretty good these days. If they were losing power from the filter, they'd make it bigger, which they have.
It'll take a long time for any noticable wear to accumulate, but if there is no real benefit, what's the point?
I was at a drag strip in CA a while back and saw two 335s set up identically, except one was a coupe with an injen intake, and one a sedan with an OEM intake. The one with the OEM intake was faster every time, although it's possible there were other factors.
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