There's lot of talk about the underdrive pulley on SL. Seems like everyone that's done it has liked it and noticed small gains.
You just have to remember not to expect alot from a small mod like this. It will free up a couple hp from the engine but prolly not anything you will feel.
From what I've read, people say:
it gave them maybe 2-3mpg better per tank
slight increase in low end torque
no one has said they noticed any difference in their air conditioning performance or other accessories, since that's how it gets the extra power.
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