Can-Am / BRP Stm secondary September 23, 2015 I purchased a gen 1 STM secondary from a buddy, just wondering if there are any major differences/performance advantages between the gen 1 and the gen 2? Wondering if it would be worth just getting the 2nd gen or keeping the gen 1 for now. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related