ISO - About ISO
They have standard test for the aftermarket filter companies to compare their filters. All though I am sure each one is bias, I went with the S&B intake partly from their testing and the rest on their guarantee with their product. I am happy with it and its was one of the least expensive. Check out their web site for more info.
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07 F-350 xlt 6.0 PSD LB CC SRW 4x4, black on tan, A/T, 5" exhaust w/4" downpipe 
67 F-250 Project truck, currently in a billion pieces
70 F-250 4x4 (highboy)
Past trucks: 04 F-250 xlt 6.0 PSD SB extcab 4x4, 6spd, all stock and 97 F-250HD xlt 7.3 PSD extcab LB 4x4, 5spd, Superchips tuner, 4" turbo back exaust, K&N CAI, 02 intercooler installed, Sold
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