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Bill Verburg Bill Verburg is offline
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Join Date: Dec 2000
Posts: 23,472
Originally Posted by spyerx View Post
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.
I understand that, that's why I suggested capping the the lower inlets, the upper will be more than sufficient and quieter.
Bill Verburg
'76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone)
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