Highflow Catted Front Pipes
 

Just looking for confirmation before ordering.

I'm most likely going to go with Perrin Over Pipe + Catted Front Pipe (to add to my current catback). I know the cat is high flow, which is great and less restrictive, i'm curious about how it compares in emissions duties. Will replacing the stock front pipe cat possibly cause emission to be significantly worse or a CEL?

Leaving header stock as I read the primary cat and sensors are there.

It'll probably be fine, but in order to give a definite answer someone would have to do an emissions check with the stock cat, and then one with the high flow front pipe. That's just not likely to happen anytime soon.

You won't get a CEL because there's not another O2 sensor behind the cat in the front pipe.