Quote:
Originally Posted by spyerx
ON the GT3 muffler the lower holes are high flow with a simple 'gap' baffle. On my 997RS when the valves open it directs all flow to the lower holes. The top holes are the 'quiet' holes. And are much more restrictive.
So yeah if you want it quieter use the top holes.
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I understand that, that's why I suggested capping the the lower inlets, the upper will be more than sufficient and quieter.