Maybe have lost a tiny, tiny bit of free revving over 5000rpm. When I had the airbox panel off, the car revved up to redline effortlessly.
Now, if you concentrate on it, you can tell it takes a touch longer to reach redline... but yes, it does feel a bit stronger (but much more "together") in up to 5k.
hmm, will see if a larger diameter tube will make a difference above 5k. If not, Imay have to make an "Andy Powerduct" this weekend and see if I can have the best of both worlds.