I'm looking at used catback from aFe for 6.2L trucks and it is 4" pipe. Is this too big for a stock engine? This is the system,

https://afepower.com/afe-power-49-44116-b-apollo-gt-series-4-409-stainless-steel-cat-back-exhaust-system

I have looked at pictures and looks like this might fit my 2011 despite being for 2014-18 trucks, the hangers and locations look the same. Anyone have experience with that?

 

The size of the pipe doesn't matter, it wouldn't care if the pipe was 4in. It doesn't have the power as it sits to outflow the stock size pipe right now.

 

Stock 6.2 exhaust on 900s is 3.5" which flows plenty down into the 12s with a muffler delete.

 

I'm just looking at it to replace the factory system as my flex pipe is broken, and this used catback is almost the same cost as fixing the flex pipe. My only concern is losing power with a 4" exhaust on a stock engine.

 

It won't even know you changed the size of the pipe, it's fine. The exhaust is already going through 3 cat converters before it even reaches the cat-back.

 

Thinking to myself “don’t ask about back pressure. Don’t ask about back pressure.”