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This thread made me go to my local shop because I just couldn't wait any longer for that nice deep burble from the flat 4. My local shop did it for me for about $290 (thanks CA tax) with nice 4" double walled tips and 2.25" piping. It's loud but in an amazing way. I can also confirm that at 2100 RPM and again at 3700 RPM, there is some drone. On the freeway on 6th gear, there is not much noise (cruising). I'm enjoying it, but the wifey is not liking it. Sigh.
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