This action was enevitable, every manufacturer that developed and sold equipment that defeated emission equipment is just as guilty as any other. If you go by advertiseing alone then MBRP is the biggest culprit, they have blatently advertised emission defeating exhaust systems since day 1. But I haven't heard anybody bash them yet...
MBRP must have stopped building crappy exhaust components... I saw an MBRP pamphlet the other day at a local diesel shop. MBRP is selling crap for jeeps now. Body armor, skid plates, rock sliders, bumpers, tow shackles.