Originally Posted by jameslleary
Doesn't the 09 and up F-150 already have a straight through muffler?
Flowmasters are no good, they just make a signature sound. Straight through is the way to go.
[QUOTE=otto457;811257]I know the 2009+ trucks have the "hybrid" type muffler. I consider it a hybrid because while you can see through it, it still has the chambers that do the sound deadening. The stock systems have come a long way from what they use to be, but still aren't perfect.[/
That depends on what you are trying to accomplish, sound or performance gains. For me sound is more important, so I replaced my stock almost 3 ft boat anchor with a much smaller lighter 2chamber 40 series flow master si/do.I seriously doubt there is very little horsepower gains difference on a stock behind the cats system whether straight through or chambered. I have not noticed any power loss,IMHO. But to each his own