I think you already know the risks of a NOS shot gone bad. Worst case you blow the engine. NOS is a hard shock on the drivetrain, unless you set it up on a progressive shot. NOS makes a setup that add NOS progressively over a period of time (user programmed) so the power added is more linear (TURBO-like) and less chance of shocking the drivetrain. There are people running 100hp shots, just be careful.
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I might be stupid, but I AM NOT crazy....
