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Seeing your 2 latest postings, you must have a vengeance going with some 5.3L buddy of yours or something! I know you mentioned that you're looking at new trucks 4.8 vs 5.3 and comparing, and I really think that the $1500-$2000 dollar difference for 10HP and 20-30 ft-lbs is not worth it. IMO. Based on the other posting, upgrading exhaust and filter all ready has you close to if not equal to a 5.3L and the nelson tune should get you by a 5.3L with no problem.
 
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