TP Underdrive Pulleys

[Jackpine]

88Racing would be the one to answer your question definitively, since he's recently installed a set. I think, though, they WILL give you increased power and possibly slightly better gas mileage since they reduce the work the engine has to do to power the accessories a bit. And, those accessories might just last a wee bit longer, since they aren't spinning quite as fast.

You may not need to increase your idle speed, but if you do, probably by only about 50 rpms.

- Jack