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2000 ch 427 hp low boost



Hello was wondering if I could pick your brain...recently took this truck from 350 to 427 using correct part numbers  on the injectors and turbo , set the valves while is was there and had mack dealer reprogram Ecm.  Truck has only 320000 actual miles on it...before it would only make 19 to 21 lbs of boost regularly.  Now it only makes 20 to 22 lbs regularly.  Truck runs ok but not a power house.. I feel like there is more power there by changing intercooler maybe? Or maybe cleaning a check valve ? Also last 6 of the vin 125886 maybe there’s a data file upgrade?


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