Actually, the new one is on the right.
I set it up so that the 90's we on the exhaust. However, IMO, its best to run the reactors w/out them, and hook the hose directly up to the reactor.
I think its much better than the old style because the old style used a series of PITA screws to hold it together. With the new style, its really easy to take it apart and clean.
Jim