I'm with SoCaliAllStar82. I got MagnaFlows on my Tundra. My buddy has a muffler shop and I asked which I should go with. He said that Flows are loud, and don't offer that much in performance. MagnaFlows give it a great rumble and really open up the exhaust to minimize resistance.
I do think magnaflow has better quality, I just bought my Tundra Sport a couple months back the guy before me installed a flowmaster on the stock 3" exhaust it sounds pretty damn good for the money. I will upgrade to the magnaflow dual 2 1/2" part# 16653 when I get blown due to the fact single 3" is only good for about 365hp and dual 2 1/2 is good for about 515hp. It justs depends on what you are doing.