As a casual observer of these drone topic threads, it seems to me that the cheap eBay mufflers drone because one thing they all have in common is there is no cross-over pipe between the two mufflers. So there is a completely separate exhaust system for each cylinder bank and at a certain rpm the two separate exhaust streams create the drone. If you look at the Fabspeed maxflo muffler it has a cross-over pipe between the two mufflers and their latest edition also has a cross-over pipe in the exhaust tips too. The Fabspeed unit is a lot more money than the eBay ones, but perhaps adding a cross-over pipe between the two mufflers on an eBay unit would eliminate the drone.
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Current: 2022 718 Cayman GT4, PDK bone stock (the dark side).
Former: 2003 S, 3.6 LN Nickies, ARP rod bolts, under-drive pulley, Fabspeed sport headers, Softronic tune, 987 airbox 987 motor mount, Function-First Sport motor mount insert, Ben's short shifter, Nine8Six projector headlights & center caps, ROW M030, stainless flexible brake lines, B-K rollbar extension & fire extinguisher mount, hardtop
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