The car has a new cat converter i just put it on in march along with a brand new exhaust system it's all walker from the cat to the muffler. The only thing on the car that is not stock is an obx stainless steel header and a dynomax super turbo muffler.
I know that the muffler would not have anything to do with the high hc but what about the header?
I drove the car for 20 minuits prior to the emission test so it was all warmed up.
The spark plugs are oem AC delco and the wire set is an oem style set from autozone i was running regular gas when i took the test.
It has never has a check engine light come on and the car runs fantastic not a problem at all with the way it runs.
The only thing that i can think of that might be causing it to fail is the obx header what do you guys think?
If i put the old manifold and head pipe back on it might pass although i dont see how a header could cause it to fail
I would really hate to have to take the header off i really love the burbly sound it gives to the exhaust system it has a nice rumble when it is idleing