we just installed some 106400's in my buddys Mach he had JBA mids, X pipe, SLP catback, K&N CAI, and UDP. we didnt degree them just slapped them in with the right valve springs and he just got it tuned Yesterrday made 371rwhp STD on a dyno dynamics dyno in 104* heat. id say that it a happy dyno but ive seen alot of cars dyno on it and the numbers are not at all high.
So with a short runner your buddy would be at about 380 rwhp. So about 20 hp more than the smaller cams.