Well the moral of my story is DO Not buy a cat from Canadian Tire,it turns out after putting all the stuff in the car and having it fail again i got them to do the diagnostic on it, and sure enough the cat i bought from crappy tire was a dud had like 10% effiency 140 bucks later and some begging i got him to make the test pass wink wink so now my nox reads zero lol.. Thanks for all your input guys wealth of knowledge on here thats for damn sure..