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spyerx spyerx is offline
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Join Date: Apr 2013
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Originally Posted by Bill Verburg View Post
You aren't going to hurt the torque curve. Pipes need to be sized proportionally to the expected flow, but a muffler servers a different purpose and works differently. For a muffler generally there is no such thing as too big, You'd probably want to just use the upper inlet and cap off the lower one
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.
Old 02-02-2019, 03:08 PM
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