Need more power
 

I bought a 97 12 valver with 150k on it. I also have another 97 12 valver with exhuast, flow and fuel plate. The new 12 valver just has no guts. After 60 mph I can put it to the floor and seem to be able to get to 65 and thats tops. It has stock exhaust, air flow. Anything I need to check that may restrict it from getting more mph. And any new ideas for getting just more power. Its a auto trans and dually.
Thanks

slide plate full forward, get gauges, or yank the plate and get a tc and vb,

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i have no plate in mine and the mileage is not bad if you drive with some sense.

but on the turn side if you do drive without since the milage goes down. you can almost watch the fuel gauge go down.:argh: but ill still never switch back to a plate