Question

[cvpiftw]

This is not your guys (trilogy) stuff, but just curious if you can use a underdrive pulley with a piggyback style supercharger pulley if you use a eaton.

[SC Cheesehead]

If you're referring to the lower U/D pulley; no, need to use the OEM lower pulley and balancer.

You then install a machined hub and lower pulley ring obtained through Metco. Lower pulley ring size is determined by the upper pulley size on the Eaton and desired boost.

Product ID: MMC0001
Supercharger Installation Kit
http://www.metcomotorsports.com/products.asp?cat=114

I went with a stock upper and 2 lb lower pulley and I'm running 10.5 lbs boost.