[marinb]

Originally Posted by inTgr8r

Don't forget that we are dealing with 2 entirely different types of CATs.
High performance metallic vs. OE ceramic.

http://www.zpost.com/forums/showthread.php?t=688556
IDK if you've seen the write up by 'avsbmw' on his DKF 300 cell kit.

Thanks. I didn't see that write up before.

So what's the difference / benefit of metallic vs. ceramic?

I'm on the fence for this GB. I don't think I want to run catless, so I'm trying to figure out if it's worth running the 300 CEL vs OE Cats (currently have Fabspeed headers and Evolve tune).