IMO it doesnt matter if its a n/a 1800 or a full blown turbo monster, you can't compare a custom live map to a generic map, its not just the final power output you have to think about but the way it drives, how it comes on boost and spreads the power through the rev range. You can change the way it drives from having less power spread through the rev rang or gain more bhp at a sacrafice of moving the power b further up the rev range etc

I would never have a generic chip after having a live remap, for a small bit extra you gain a lot more