[QUOTE=Young Performance;3620413]There are 2 things going on. It does have a wastegate to control boost. It probably has a smaller pulley (more power) than it needs. For example, it may have a pulley capable of making 15 psi, yet the wastegate dumps off everything over 12 psi. It will allow the engine to always make 12 psi no matter what the conditions (hot ambient temp, high altitude, etc) It will also make quite a bit more torque down low since it will make more boost at any given rpm than if it just had a pulley capable of 12 psi in ideal conditions.
The other thing it does is allow them to have a bypass valve to help with idle. Since it's a PSI, it doesn't normally have a bypass like the Whipple's do. That will make the thing idle like a champ without any blower surge.
Hope that helps explain it.
Eddie- Tell Richard and Bruce to get a move on it, Havasu is coming fast!!!