Sounds like a load of crap to me, the stock upper already outflows the stock lower.. don't see how that's going to help at all. For $320 you can get a used cobra/explorer/performer/trickflow upper and lower intake..
yes you do...i had the comp cams with a ported lower and i loved it. it made about 25 more hp than my ported cobra that i have now. But....with the comp cams it was no fun to drive below 2500rpm so it had to go.