I installed my T1R 63mm exhaust with a T1R 63mm test pipe almost a year ago and I had a CEL until about 3 months ago. Any idea why it went out on its own?>\

 

I'm not sure why, but you should be thankful.

 

CEl light burnt out? haha, does it come on when you're first starting to turn the key?

 

Yeah, you called it. Every light comes on when I turn the key except the CEL.

 

Dude, there is a very easy fix for this. Get two spark plug anti foulers the size of your o2 sensor. Screw them together. Screw one end into the test pipe where the o2 sensor goes and screw the o2 sensor into the other. Your CEL wont throw a code. Trust me. I hallowed out my cat 2000 miles ago and did this and I haven't thrown a code.

Get the light fixed though.

 

might want to get that fixed, you'd want to know if other codes pop up.