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You know the old saying "A opinion is like a ***, everybody has one."
My opinion of air intakes are none are worth the money. I'll be the first to admit the Air Force One with the polished stainless steel tube looks good, just don't believe the $200.00 + price tag is worth it. I cut the "snout" end of my air filter canister off. I then extended the large diameter of the canister forward past the front radiator frame, made a few close and panels and seals. Now I have a 8 + inch un-restricted cold air intake. Also installed K&N filter. Complete project less than $60.00, and it made a huge different in power and throttle response. Also keep in mind some of these kits pull in hot engine compartment air, which is NOT good.
Well there is my .02 cents worth.
I would agree that there isn't much of a restriction in the stock inlet on the V10. It's 3"+ stock from the filter to the engine. The aftermarket systems don't look any bigger. In fact, Banks only provides a new inlet cover with a larger opening and K&N type filter. It reuses the rest of the stock system. If you want to change the filter then I'd just go with a replacement K&N type. Don't expect much.