Thanks again to Mark for setting up the Supercharging sub-forums!
This general forum is for comparison discussion, general accessories and performance discussion native to blower kits (spark plug gap, intercoolers, engine setup, ACT's, injectors, etc.).
As to the sub-forums...
Roots is for Allen, SVO, Lightning and other Roots-type blower threads.
Twin screw is for Kenne Bell, Lysholm (Whipple), Allen race kit etc.
Centrifugal is for Vortech, Paxton, etc.
I've gone through and organized all the old threads to their appropriate sub-forums. If I've missed any, PM me the thread with a note to move it to the right place.