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Posted

Hi I had my muffler and flapper cut of on my 2018 gmc sierra 6.2l  my exhaust is 3.5 in ,shop installed a 3 in magnaflow muffler adapted it to my 3.5 in pipe ,will downsizing flow loose me any power or mpg or issues  thanks guys

Posted

No, it's fine.

 

The truck doesn't make enough horsepower to outflow a 3in or 3.5in pipe, so the neck down at the muffler is no big deal at all.

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