I just replaced my headers, with the same ceramic coated headers, but now my collecter is off by mm's with the y pipe, which every three weeks I got to change the gaskets, is there any way to line it up or should I just get a new y pipe made up.

 

i would loosen the header flange at the engine, and the collector, and line the collector up and tighten it first.

then go back and tighten it up at the flange.. go slow and see if it will square back up with the motor.