Originally Posted by XwChriswX

He never said anything about sound, just about HP. So the responses he's getting are the most power gaining mods. If sound was an issue, then that would change things. (Although not really, I'm sure the same people will say F.I. sounds the best to them.)



I've had my pulleys on for 5k now and had Zero problems with vibration, noise, power loss, oil loss, grinding, or failure of any sort. And I was skeptical at first. But now, as long as they're installed properly, I see no problem with them.

Originally Posted by daisuke149

where does it say they will throw off the balance?

you'd have to show an article or research showing that the OEM pulley is balanced per each individual motor...