I,ve been thinkin bout runnin 10 series mufflers in place of my 40 series flowmasters. I got stock manifolds and cats. I was wonderin if I would lose too much backpressure from the switch? Can anyone help me out????

 

If you change from 40 series, to a 10 series you won't notice much change in low end, if any at all.

 

And you realize that back pressure is when you are coasting down the hill and your engines tries to hold back speed and during that process the exhaust rumbles a little bit. If your talking about your velocity you will still be able to remain low end power.

 

here's a vid of my set up with 2 10 series flows

http://www.youtube.com/watch?v=y7fVzFjbzFg