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Is there any sound difference between a "sport" exhaust center muffler (valves on either end) and a "PSE" center muffler (valves in the middle)? 2013 (non PSE) CS2.
There are three different muffler sets for the 991.1
1) The base model below is always quieter throughout the entire RPM range and has no valves
2) The non-PSE S model muffler should be a little louder in the low-range and had valves that are opened at higher RPMs to become louder and free-flowing than the base one
3) The PSE one is a little throatier still in low range when closed but can be opened at lower RPMs to be even louder while still in the low range, and of course is the loudest in the high range when the valves always open. The PSE is also the only exhaust with a cross-over X-pipe built in.
Here are the three exhausts, followed by the three flow diagrams to help understand.
09-16-2018, 03:47 PM
Sound difference
