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A stock cat is really slowing your system down. You spent all that money on exhaust and you have a huge bottleneck with that stock cat.
I have a Burschur 2.5" turboback exh, and I have a 2.5" free flo cat. I put the car in during the winter months becuase yes it does make the car quieter. During the summer its annoying to have such a loud exhaust with the test pipe, thats why this year Im going to weld in a bullet muffler in place of the free flow cat and put on a resonated tip. That should help.
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