Truck is stock except for cat back and K&N. Two my Bass Boat all the time. The last couple of times I went to the lake it seem that it was working a little harder. The boost gauge was my reference. It was a little higher in the vac. section indicating I was apply more throttle. Gas Mileage also seems to have fallen a little. Could it be a cat going bad? Any other ideas?
Thanks

 

fuel filter,air filter,plugs and mas sensor basicly the normal maintance things