I lost the cone in the air box on my 156 about 6 months ago. It was louder by a small margin, and had better pull higher up the rev range. However, after several hundred miles of running I noticed that the car seemed less powerful at lower revs, especially when pulling off, and being a sele, you can't do a lot about it. I put the cone back in, and the low range power came back.
this is what intake tuning is all about, a longer or narrower intake will give you increased low rpm torque and reduce high rpm power, a wider or shorter intake (or one with less restictions such as the baffle cone removed) will give less low rpm torque and more high rpm power. that is why adding an induction kit can make the car feel flat at low rpm.
at the other end you do the same thing with exhaust tuning, a more restrictive exhaust gives more torque and less power; and a less restrictive exhaust gives more power and less torque. that is why cat replacement pipes are often said to make the car feel 'flat', that is the loss of torque the owner is noticing.
the old argument of what is best to tune to, more power or more torque, is a difficult argument with no real answer other than to go for forced induction and tune to both
to really notice the difference intake tuning makes, attach your MAF direct to the throttle body and attach an induction kit to the MAF, below 3500rpm is dead but above 4500rpm there is a huge gain. i tried this on my 1.8, its the best way to gauge what you are dealing with before beginning your intake tuning, once you know the outer limits you can work towards the best median. my intake it currently tuned to be the best that i can get it, i've experimented with different lengths and widths and guess what, the stock intake pipe with the MAF on the end and the induction kit on the MAF actually works best (that should be no surprise, a lot of time and effort has gone into the intake tuning process by AR). the only real difference i have made is reducing the MAF housing width slightly to increase both torque and fueling, and installing a 6" wide feed pipe on the induction kit to increase air pressure, combatting the loss of power the MAF would usually create, but thats a secret so shhh.