Yes — but with caution. Since NFS MW is an offline, single-player game, using a trainer won’t get you banned (there’s no anti-cheat). However:
Most modern versions of these trainers for NFS MW include several key features that can be toggled with hotkeys: Infinite Resources : Instantly gain unlimited Nitro (N2O) nfs mw mega trainer
A: You activated "Mega Speed" too high. Reset the trainer or press the default speed toggle to reset to vanilla stats. Yes — but with caution
Dominate the Streets: The Ultimate NFS MW Mega Trainer Guide nfs mw mega trainer