I have 80DD and 100Perf, and I can tell the difference... I wouldn't bother doing 2 80's, I had the 65DD and the 80DD, and there was really no difference, so I had the 65DD removed and set to stock. It's funny, just going from stock to 80DD at idle, you can hear the difference in the way it runs. Just my .02
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02 F-350 Super Duty SCSB 4x4 SRW 7.3L TD, DIY-I, PHP-6 Phoenix, 4" Turbo-Back 409 MBRP, Glowshift 3 in 1, Fisher 8' MM2
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