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The sump kit comes with this diagram to show you where to drill the 2 1/2-inch holes in the tank. If you cut the tank to the size of the sump, you take some of the rigidity of the tank away, and now there is no baffling for the sump. Just take a center punch and mark the holes, and then drill with a hole saw. We didn't need the hole closest to the front since we shortened our sump.