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i have a gruppe m intake on my m coupe and it completely replaces the oem airbox and filter. i am going to presume this is the same in the 3.0si as well. i do not, however, have the rpi scoop and cannot comment on its benefits. of course, just by virtue of its design, without a doubt it forces more air through the intake, and this effect increases with speed.
one thing i should add about a gruppe m, it frees up a lot more engine growl and the sound is absolutely intoxicating! at least on the s54 in the m coupe's....
did capristo get back with u?
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