What's a good muffler for dual exhaust?

[TexasBlownV8]

Ok I'm not really fond of starting another muffler thread, but here it is anyway.

I'm running Mac LTs and Magaflow high-flow cats, then both sides straight back to stock GT mufflers (no x nor crossover pipe of anykind). And 2.5" piping all the way (not 2.25 like on the stock setup ahead of the stock Y).

With running F/I, it seems the GT stock mufflers are causing a little more backpressure than I'd like to have, but they are fairly quiet, which I dont mind and actually prefer it.

What would be a good alternative that would increase exhaust flow and not be too loud? Any dyno numbers to back up choice differences?

I'm thinking the FRPP GTAs are something I may look into, but I do not know how much different they are from stock GTs. And what do the flowmaster's sound like with such a setup? Any other suggestions?
My interest is best-flowing first, with some quietness second.

I've tried the 'louder' route, using some magnaflow 4" round resonators only and straight-out pipes with no mufflers at all; the straight pipes sound better but are a little too loud still.

 

[Lee's05GT]

i have the magnaflow duels with a bbk x-pipe on mine and they sound great! But they sound like shit with the cats off. Kinda sounds like a old firebird lol. but other than that they are awsome

 

[SilverBolt]

i dont have fi but i do have mac lt's with bassani high flow cats, and flowmasters. ill post a video later today on the thread so you can hear

 

[bronxbomba63]

I have Flowmasters. I don't know how they sound compared to a 6 with the stock GT mufflers, but they are kinda loud, and I had to get used to it's drone (which I don't mind anymore).