What is the afx udp

[Talon5786]

Alright if anyone could help me hear wat is the afx udp? and wat does it do? Also how much does it cost?

 

[97eclipseRS]

$200 at www.howellautomotive.com

 

[Eclipse96Ryder]

its an underdrive pulley

i got one on my car and its fricken sweet. I got great power gains. From what I understand It replaces the stock pulley, you have to buy 2 different belts to make it fit the smaller pulley. And the afx udp is a lot lighter then the stock one so theres not as much stress. When i put mine on I loved it, you get power throughout the whole power band.

 

[Case]

I've heard if you have a big sound system you shouldn't use a UDP. Is this true?