No bushings or stepped covers.
This being said there are big 2.6 chargers that do not have a stepped or bushed cover but yet meet the rules. These chargers can still have 110mm exducers etc. and not look any different than another S400 2.6. Eliminating bushings and stepped covers would still allow for the guys who want to spend the money to go out and buy a high $$$ 2.6 charger but not allow for the 2.8 and 3.0 chargers to jump down as easy.
It is hard to define/tech "off the shelf"
There is no good answer. Just as long as everyone doesn't go out and change the 2.6 class so my 2.6 build for 2010 is obsolete before it ever gets finished.
