So I took the plunge and installed the full intake box from Stillen last night.
Fit was nice, finish was nicer, and my @ss dyno says "yes, there is an improvement".
I'd say immediate throttle, like normal highway, has improved slightly, and full throttle above 3600 is the biggest improvement, and sounds just right. It's not overly loud, like a pair of 4 barrels and no air filter (I know showing my age) but normal everyday highway and around town sound is totally unaffected. I cannot comment on gas mileage becuase I've only driven my daily commute so far (75 miles), and the mpg screen hasnt budged. I attribute this to 'honking' on it more to listen to it, OR, simply put, zero mpg improvement, and frankly that's not why I bought it....
Things I found.... direction pictures are "ehhhh", but the included text helps. It's lighter a little, the air smoother (inside the air filter) is a nice touch, and the FACTORY BOLT under the factory airbox, closest to the HORNS is a real %$#*&% to remove!! However, once done, it wasn't bad. Pay special attention to placement where MAF sensor goes in. (It goes without saying that you should NEVER remove the item, and then cycle the key/ignition... right ? NEVER)...
Just thought I'd share. Enjoy.
MM