I have a Flowmaster 50HD and am pleased with it, great sound, especially with my CAI and LT Headers.
However, if I was going true dual and having two mufflers, then the only way I'd go is with two glass packs, and for a glass pack with awsome sound & great performance - nobody beats Cherry Bombs. And the great thing is they are only about $40 each...

http://www.cherrybomb.com/

 

I don't know too much about cars/trucks, but I will have 1 pipe coming off 1 header then it goes to a Y pipe and then to 2 mufflers.

So you are saying those Cherrybomb GlassPacks have better sound and performace the then 2 FlowMasters 50 HD's?

Thanks

 

i have the dual exit 50HD with the headers, and the truck sounds great...how do i post sound clips? I got a decent recording of my truck...

 

Strange, because I believe most of us have 2 cats, making it real easy to go true dual (even though I am going through a "Y" to a single muffler, then splitting again to dual exhaust). The setup you describe above is fine though, it pretty much is single until the split to allow you to use two mufflers. It'san ideal setup for two glasspacks.
As far as sound goes, the 50HD is nice, I am happy with the sound and loudness of mine. But I've alsohit 40 years old not too long ago, and what is a nice sounding exhaust to me today, would have been whimpy 15-20 years ago.
As Flowmaster sound goes, the lower the model number the louder it is. Based on that scale, a Cherry Bomb Glasspack and a Cherry Bomb Extreme would equal about a Flowmaster 10!!!
Also, because Flowmasters are a chambered muffler, the design inherently is more restrictive than a glasspack, which basically is a hollow, straight pipe except for the wound fiberglass inside it's walls...

 

Well from what I remember from looking under my truck, I have the muffler pipe coming off the engine. then right after that is a small bump or increase in size in the pipe, like 8-10 inches long, then it goes down till the muffler and just to the tailpipe.

Can I even make mine true dual? I don't think I can cause I need another header coming off the engine right?