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Q: I want to put a straight pipe with no muffler on my 2005 Chevy Silverado and keep the catalytic converter

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I got a question about my 2005 4.3 Chevy Silverado I want to put a straight pipe no muffler and keep the Cadillac converter on will this decrease my horsepower

My car has 200000 miles.
My car has a manual transmission.

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