If you mean INTAKES, then the bullet intake really shines in blown applications (from what I have read). The 4.6L needs lots of air!
If you mean INTAKES as in COLD AIR INDUCTION KITS, then you might consider just a K&N drop in. I have the Roush CAI (thanks Hammer
) and it seems to be doing really well.
As far as some of the "myths" about V8's. There was an article a couple years ago that put a stock GT against the Integra Type R. Guess who won? The GT. They fixed the track so that it was VERY tight and only then did the Type R come out on top, BARELY. Never mistake an old muscle car STOCK suspension for a new V8 car design
V8's have come aways...