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I have the Flowmaster *DELTA* 50 series on my 4x4 Titan, and I dont think the drone is bad at all. Its at its loudest drone at about 1500-1700 RPM. After that, its pretty tame... unless ya stick yer foot into it. At highway cruise, I swear I think its QUIETER than the stock. No lie! As a side note, I'll add that I did have an X-pipe installed right where the stock Y pipe was. I *think* this helps tone down the drone a lot.
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