LMFAO. bump! i dont think 4,000 is too big for a 5.3. that's what all of the guys in the valley seem to run and they all run like a bat out of hell. take it from someone who went through some converters. take what you THINK you want and step it up. i started at a 2800, then 3,000, then 3200, then 3600, then 4200, then 4500....the bigger i went, the more fun i had!


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