I have purchased almost every upgrade possible through ss diesel. I have a 1998 3500 dually. I started with the 4 inch right off the get go and noticed a nice increase in flow along with the cold air intake. I have replaced my injectors to marine...
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From: Matt F.

I am very impressed with the products I recieved everything fit perfect I purchased the exhaust #9 res and the intake kit plus some maintanence items and its like I have a new truck again better power and performance soon to order the marine...
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From: Jeff B.