Pirate

Hey guys, Right after the weather turned cold I started getting the "catalyst Full service required" message on the overhead. No CEL and no changes in performance. The truck was deleted about 30K ago with H&S minimax. Full turbo back and EGR delete. I can clear the message with the minimax which tells me no current codes so I delete stored codes. The message keeps popping up on occasion. I haven't checked to see what stored codes before deleting them.

Any suggestions how to correct this so I don't keep getting the message on the overhead? Obviously I don't want to take the truck to the dealer. This is the first issue I have had since deleting and had a replacement turbo installed under warranty just prior to deleting.