Stock Exhaust Diameter On My Truck Is...?

[davo32683]

I've got a 2004 Z71 Silverado with the 5.3L. What is the stock pipe diameter on this truck? I'm looking to buy a Magnaflow to replace the stock muffler. I think they're 2.75" but I want to confirm.

[dlstewart01]

I got a stock exhaust down in my shed from a 2005 Sierra 5.3. Finally went down and measured it. It is 2.75 out side dia. both inlet and outlet.

 

Have a good day,

 

Don

[davo32683]

Thanks Don

[JAMIEZ71]

it is 2.75" but look at some of the bends the factory has it in. It is very restricktive compared to having someone mandrel bend you some 3" pipe as I did on mine from the cat back.