what are the pros and cons of underdrive pulleys.

 

ran underrdrive pulleys there were no cons. i mean it dropped your charge so you would have to rev up to charge the car. pros are it recudes drag on the motor, look nice polished aluminum, smaller and lighter, which is why it frees up more power.

 

Do a search. Underdrive pullies have been discussed many, many times.

 

No cons yet that I can see. My battery charges good at idle if I only have the radio on, if I start turning on the fan and headlights it drops but charges correctly at 900+ rpm.
The power difference is noticebale, even on my V6. I got mine for $20 plus my stock pulley so thry're not alot. Probably the best bang for buck power.