Question about flowmaster muffler..

[draken]

Hey guys i was just curious if this was possible or not.. I got a magnaflow Y pipe and flowmaster 10 muffler installed on my truck awhile ago and noticed that the muffler is quite small.. is it possible for me to be loosing horsepower or get worse gas mileage because of back pressure or the muffler being very small? compared to like a heavy duty 44 serious or something along those lines?

 

[fresnoexpress]

I asked a similar question recently except in regards to my muffler delete. I was informed that our shouldn't be an issue so I doubt the flowmaster 10 series would be a problem.