FASS 2023-2024 Ford Powerstroke 6.7L Titanium Signature Series Plus 140G flexfit The XD390 Valve Springs have
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FASS 2023 2024 Ford Powerstroke 6.7L Titanium Signature Series Plus 140G flexfit The XD390 Valve Springs have The XD390 Valve Springs have a reduced OD and will fit all 1998 7L engines is perfect for the person looking for a moderately aggressive sound level outside of the car while maintaining a mild sound level inside