As a long time crossflow driver (I've had mine 10 years) all I can say is, yes, they are noisy, induction and exhaust, the thing runs in and out of tune all the time. I have tried a number of things over the years and some work some don't. Slick 50, the oil additive made some difference, as does checking the tappets from time to time. make sure the alternator bolts are all present and correct, the lower front one seems to dislike being on the car and escapes at every opportunity. Apart form that, regular oil changes and top ups and it should last for a few tens of thousands of miles.
The main thing to not worry about it too much, and enjoy driving.
like Brent I enjoy changing down to get the full impact of the sound in a tunnel - but be careful, the sudden increase in noise can scare the c*** out of anyone else around, especially cyclists and pedestrians...smile.gif