Jfuller...I have magnaflow SI/SO on my truck with a 4in tip(3in mandrel bent tail pipe). On the magnaflow website it is comperable to kit 16612. This is my third truck with exhaust(the first two had flowmaster SI/DO's) and I can tell you this setup is way quieter. At highway speeds you have to turn the radio off to even hear it, but when you throttle it it wakes up. It's a good setup.
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04 Screw Lariat--Magnaflow SI/SO-- PHP Gryphon--AS 2"--BFG ATs 285/65/18--
Silverstar Heads and Fogs
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