the emission laws are very strict over here!!! for years already!!! not like in the states just for some years.
but whats new is, on obd2 able cars, they will only check if there is any trouble code for the exhaust system generated. if so, there will follow an exhaust measurement (like they always did the years before). if not, everything is fine.
so. as far as your exhaust doesnt generates a cel, caused by the dp, id say you r fine!!!(hi)
