I'll proably end up looking into magnaflow once this flowmaster gets on my nerves enough. I have the whoosing noise to from the flowmaster once I really get into it is very anoying, but I really love the roar you get with them when just cruiseing but hate the sound once I give it some gas. I love the way magnaflow sounds on other vehicles but it seems on 5.3s they sound like a old set of glasspacks. If I can find a straight-through magnaflow that gives me a roar that doesn't pop like straights I will get one. I'm not concerned if it's too loud I just don't want it to sound like I have straights
In my opinion the Magnaflow's are awesome. I had a smaller 14" magnaflow on my TBSS and it didn't sound like old glasspacks, it was raspy and roared, and sounded better than my Flowmaster, it had some popping, but didn't crackle like a G-P. I stepped up to the bigger sized Magnaflow and that decreased the sound characteristics as far as popping/crackle but still sounded good when getting on the throttle.
I'll try to get you a video clip up later of my Yukon with the 18" Magnaflow I have on there, you would probably dig it on your truck, and if your cats are clogged you could have all of it done at once at the exhaust shop..
I know this is the Tahoe/Yukon forum, not the tBSS Forum, but it had the 6.0, my Denali has a 6.0, and they sounded very identical... This sounds better than a GP to me:
[YT]watch?v=VMuv5wxkgW0&feature=youtu.be[/YT]
Flowmaster with healthy cats as you can see, definitely not quiet: (and it was this loud on the Yukon recently before I replaced with Magnaflow)
[YT]watch?v=CFAg2dPcfww&feature=youtu.be[/YT]
Hopes this helps... and trust me, you wont be disappointed with a Magna...