ej1serge

hey guys well i recently did a swap on my em1 with a freshly rebuilt b16a2, everything ran perfect for like two weeks no problems, THEN i decided it wasnt fast enough, i purchased a bunch of parts for it and threw them on all at once, therefore i cant pinpoint exactly where i messed up =[ anyways, i threw on a blox intake manifold, hytech replica tri-y header, test pipe (with o2sensor) and a greddy ti-c exhaust, the codes its throwing are p0420 and p1457 i know most likely the 420 code is because i dont have a o2 sensor extender on the test pipe but the p1457 i cant figure out, ive checked the hoses on the canister, ive checked the gas cap
any help is appreciated thanks in advance guys!