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I'm not sure what the first part of this is trying to say? However there are SEVERAL custom cam grinders who grind lobes that are "stealth" or "sleeper", and idle like stock but change the powerband. But until you a.) get a dyno or b.) get some track times you could fall into that group that ryan was speaking about above. Buy the way i sell cams
So all this aero talk had me thinking and I noticed on my dads G35 there is a rear diffusor not much larger than a foot or foot and a half by a foot and a half under the rear bumper. Does something that small actually do anything? I'll post up a picture for you guys to see. Maybe it just makes it a little more stable a higher speeds, maybe they just put it there so you think that? Haha idk