Apparently my header didnt come with an "exhaust doughnut" that goes between exhaust manifold and the Cat. I need some spring bolts from the manifold to the cat. Then there are 3 bolts that connect the cat to the midpipe, 2 we got off no problem, the 3rd one we got the nut off but it looks like the bolt is welded on to the cat or something, so there are only 2 nuts/bolts connecting the cat to the midpipe. Then Apexi gave us 4 bolts too few, so I have to go to the hardware store to pick up some new bolts/nuts/washers for 4 of the joints, because we just have temporary old nuts/bolts that we had laying around in their place for now.

My check engine light is on now, I'm guessing its pretty obvious why it's on. Because my exhaust is leaking in probably 2 different spots. Does that sound right?

 

no i dont think its because of the exhaust leak, what model car do you have? If its a DX, you might have had some trouble plugging in your oxygen sensor (s)? You're probably pulling a "catalytic converter efficiency" light, depending on what model and where you plugged in the sensors.

 

I just installed a header on my DX an I'm running around with a CEL...but mines because I dont have a cat on right now