State low are atleast OE replacement which is besically any "chambered" exhaust. This is why domestic V8's & such arnt bothed with have FLowmasters, Borla's, Dynomax & suck & we are harrased over the straight through type exhaust systems which "are" illegal. If you can take papers, pics, spec or what ever for you exhaust system showing its an chambers exhaust system you shouldnt be charged