I have the same Spectre Intake on my truck. I've had it for over a year now. I cant say much about the sound (i hear my exhaust more than I hear the engine) but it does seem to add a better throttle response after all I believe it's a 4 inch tube sucking the air in. I love the look of it when you open the hood with the chromed tube and massive filter
...much nicer than the stock intake. The install was kind of difficult because it fits kinda tight under the hood. Also, the rubber tube was too short (a fairly common occurence from what I have heard), I had to buy a longer one from Lowes. But overall am very happy with it.