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or the valve can fail and cause exhaust gas to be constantly pushed back into your engine
they also have expansion-controlled designs for narrow fitting clearances
If you use silicone instead of a gasket on the front cover
Our design preserves thread engagement whereas other companies do not
2003-2007 Powerstroke 6.0L 4" Turbo Back Exhaust w/ Muffler (421024 / 422020) 6.5L or the valve can fail2003 2007 Powerstroke 6. 0L 4" Turbo Back Exhaust w Muffler (421024 422020) Constructed out of 16 gauge aluminized steel or T409 Stainless, this exhaust system is designed to simplify installation with included clamps, preweld contour bends and improved flanges. Enjoy a noticeable boost in performance, lowered EGTs and amplified air flow with this Flo~Pro system. For powerhouse performance, Flo~Pro delivers horsepower you can hear!
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