Greg Corcoran
SHO Member
CO joined the nanny states of CA and NY and tightened the emission requirements to renew vehicle registration. I am failing on NOx, and after some research, apparently the best bet is revert to a stock Y pipe or at least the stock cats from a low(ish) mile car. My car is an MTX but at this point I'll consider an ATX pipe too to get the cats. Old limit 2.500 GPM, new limit 2.000 GPM. My result with the ShoSource high flow Y pipe (and their cats) 2.307 which would have passed under the prior limit that this car was built to meet...