make sure you do a complete tune-up this will help since your parts are brand new. but make sure you check your oxigen sensor, cuz if its bad this may cause ur ecu to fuck with the air-fule ratio and you will not get the best combustion and ur car will not pass emmissions even if everything ells in the car is brand new (spark plugs wires pcv egr basically all ur emmission shit) this is one of the thing a lot of people forget to check and if it is the problem it will pass emmissions no problem