I have been pleased with the two Magnaflow setups I have had. I currently have twin 4x9x14 Magnaflows with their x-pipe, no cats and hamm headers dumped before the axle. You can check out the vid HERE. I also have some pics of it HERE
2000 Silverado, RCSB, 2wd w/ a few mods.
Best 1/4 ET: 12.09@111.22 (old 5.3L H/C/N2O setup)
WRE 370 and Kenne Bell 2.8L installed and breaking trannys.
2001 Tahoe LT 4wd
Stock, daily driver and tow vehicle.