the thing with pulley's.. dont install em right and your screwed.
With an intake, or exhaust, dont install em right you get to redo it. Thats where the risk comes in.
Pulley's themselves arent really rocket science fella's.
I wouldnt even compare these to FI. The risk is much much less. With Pulley's your not changing really anythinga bout the engine except for how much inertia is lost/used to turn it.
With intakes, exhausts, tunes, etc etc your changing the dynamics of how the car works internally. FI takes that to a different level altogether. If anything pulley's should be one of the lowest risk items. Unfortunately it attaches to a place where a wrong install could be bad.
You can compare a pulley system to a lightweight fly wheel. Good stuff unless again installed wrong.
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