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The q300 axelback gets louder as it ages for sure, Like some other members said, it growls at lower rpms and gets quieter up top. I just recently installed an AEM CAI and now the exhaust is louder all the way through the powerband. Like HellaMod, Im thinking about putting the midpipe in as well, I have the RWD model so it would be a bolt on. I'm worried about bringing too much attention to my car though, with the louder exhaust, and smoked lights, probably a risky decision.
I just put on my Invidia Q300 + Midpipe about a couple month ago and I personally love it. Its not really that loud when you're cruising but when you step on it, it sounds amazing in my opinion.