[tirwin]

Think of the cat/test pipe/premuffler + muffler as combinations. Some are better or worse depending on everyone’s subjective preferences and budget.

I love the raw sound of my 2-in/1-out with the test pipe. When I fired the car up at gatherings I always get a big thumbs up. It was over 90dB at idle though. After 5-6 hours on road trips in the car I was mentally exhausted. (ha! see what I did there!)

I tried putting a cat back on and it knocked it down some, but not enough. Mid 80s. My entirely non-scientific study with a statistical sample of 1 suggests that the car/test pipe/prefmuffler variable is worth around 10dB difference in the equation, give or take.