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I have a 94 GMC with 165000 on it when I did mine I went with shoty headers Hi-Flow cat and Flow Master 40 out the back system the truck sounds great!! yes you can hear it inside the truck to me it`s ok. Flow Master builds Great quilty stuff I would buy it again everything lined up perfect and for the money I don`t think you can beat it.(just mt 2 cents)
I only changed the cat because of the milage and did not want to do it twice.
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