02GT throwing alot of codes

My car is currently throwing the following codes

P0443
P1451
P1409
P0135
P0141
P0155

I have a K&N FIPK II intake, BBK X-pipe with cats and steeda mil eliminators, and flowmaster cat back. Can someone please tell me where to start with all these codes. I already know what they are just not sure why it is throwing all of them. Thanks guys.

Nevermind I got them all fixed, it had alot to do with where my car was originally purchased in Colorado Springs so it had that primary high altitude driving crap in the ecm. But I got it all fixed by a really good tuner near where I live now.