one more point, random tech is one the best high flow cats... retail is around $250 OEM retail is $890-1000 so, eliteaccord take ur pick LOL... random tech is one of most expensive and reputable High flow cats, maybe second best only to Jackson racing i think and a very few others.. beside, both pass emissions, and u get twice as much air flow in a high flow cat... so better high end performance, not low end... i kno. but it costs a 1/3 of the OEM. so y take an OEM, if both pass ultimately?