Q: Cat back with h22a4 resulted in some power loss .

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Hello. I recently installed a Catback exhaust on 01 lude with manual transmission. The catback in diameter is 4". The stock exhaust felt like it had more reaction shifting gears than the newly custom exhaust . I also installed a universal catalytic converter as well. Does anybody know why it feels a little slower . Even when I accelerate , the rpms tend to skip which is abnormal. Please answer , thanks

My car has 80000 miles.
My car has a manual transmission.

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