1991 Cams

I know this question has come up a lot before, but i just want to get some final info... i have a 1996 240 and i was wondering how much of an improvement the 1991 cams would do if i bought a pair for my car, ebay says 15 HP which i think is bulls*it so i figured i would ask you guys! I read somewhere that they knocked a tenth of a second off the cars 1/4 compared to the rest, but that doesnt really seem like a great big improvement if im not drag racing. Are there any other noticeable improvements with these cams, or is the change in performance rather minimal?