Curious- I know the GHL drones pretty badly on the 2.5, 2.7, and 3.2L Boxsters. Does it also resonate on your 3.4? Also does your Mille Miglia exhaust also drone?
If so, and you already have a stock muffler, you could take the stock muffler to a shop to do a Pedro style bypass, and it would not drone like the aftermarket exhausts do while still giving you nice sound.
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