I kinda agree with Big Sur.
However, I went from canned to custom 87 tow and 87 performance. Felt a good change from canned to custom on the tow, while the performance was better on the upper end. Never ran the canned perf. because of CAI installed.
Now run the performance unless towing. Throttle seems a little quicker in it. Love the WOT kick I get when some idiot wont let you change lanes. Gets the big SCrew movin' quicker than they expect. Hope this helps a little.
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2004 SCrew Lariet 4X4
5.4 K&N CAI, Flexalite fans
Flowmaster 2.5" True Duals w/ 50 series mufflers & X-pipe 3.73LS
Percision 120 wire grills.
Gryphon CS
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