Misfires are not what you want on a dyno run, most likely cause being a poor spark or timing issues especialy if the car is running a hpfp, it will highlight any weakness in spark plugs or coils. Idealiy after having things like a remap, intake, downpipe fitted ect.... you should have your readiness code reset by your main dealer, or sum1 who knows what there doing using VAGcom, this is a procedure that adapts all your engine management electronics such as throttle angle, coolant temp, air mass, manifold pressure and lamda readings. over the course of afew weeks your cars ECU will adapt to the modifications made so you may find this unnessasary, but i would not put to much faith in dyno readings takin directly after a remap, it makes sense that his hp increased and leveled out as the time passed
