Mild is intake header and exhaust. Chipping might be considered a minor mod depending on how you do it. Base lines are cheap and and relatively easy. Dyno time + tuner is not so minor.
Internals like cams, valves, port and polish, pistons, a stroker kit, etc. Those are serious mods.
Internals like cams, valves, port and polish, pistons, a stroker kit, etc. Those are serious mods.