Does anyone use aem underdrive pulleys? I want to get a set because people say that it increases hp and i hope that they won't be as noisy as stock. When I open my hood all i hear is pulleys moving.

 

I won't run an after market crank pulley because of all the bad things I have read about them, the little gain you will see is not worth risking my hole engine for it.

 

Don't those things undercharge your battery?

 

Just asked this recently, never really got solid answers, seems like just what people have heard or read. Here is the thread: https://honda-tech.com/zero...45239

 

I've had my AEM underdrive pulleys on for 22 months and over25k miles and haven't had any problems. I do get a slight dimming of the headlights at idle. I would advise against them based on my experiences if you have a large sound system, sit in a lot of traffic or at idle for long periods of time while running your A/C, lights, etc.

 

The AEM pullies don't include the crank pully. They will improve your power output, but not by a lot. They shopuld not be used if you are running a high output stereo system becasue the alternator can not provide enough charge.