I've got a mild cam in my A15, but it sounds good with head work, Dellorto's, headers, and 2 1/4" exhaust with turbo muffler. I used to have a straight through "glasspack" muffler and it definitely sounded nice and throaty, but I got pulled over a lot and my ears rang after long drives. To get the best of both worlds, I put a Flowtech Race Ready exhaust cutout before the muffler so whenever I want that loud obnoxious race car sound, I just uncap the cutout. Mine only revs to 7200 rpm though, but pulls hard from 3000. I'm still trying to figure out "metric" cams, I'm used to lift and duration in inches. I was thinking of a heftier cam from Matsuoka, but I like mine.