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Originally Posted by jonwalden68
Yes you need the back pressure! i have an 04 f250 with the 6.0 with a 5 inch pipe with a 3.5 inch down pipe with no cat but a high flow muffler!I love the sound!
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You say yes, and others have said no. I think i'll use the uffler and no cat....just to be on the safe side as far as the back pressure.
Thanks