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Ships within 48 hours · Estimated delivery Aug 8 - Aug 13
Our Valve Springs are heat-treated and stress relieved to increase Spring Performance
You are using a box tuner or no tuning at all
Groove depth
6L Duramax LB7/LLY/LBZ/LMM/LML engines
Pyrometer recommended
1999-2003 Powerstroke 7.3L 5" Turbo Back Exhaust w/ Muffler (521101) 3.0L Our Valve Springs are heat-treated1999 2003 Powerstroke 7. 3L Aluminized 5" Turbo Back Single w Muffler (521101) 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!