Hey guys - thinking about picking up a berk hfc for my 08 cr. Car is stock other than a k&n intake. My main question is should i go for the 63.5mm or the 70mm? Is the extra diameter worth it in this application? Anyone running this setup (otherwise stock exhaust)? Thoughts? May do header and/or cat-back in the future, not sure yet. HFC seems like the best exhaust power bang for the buck. Thanks!

 

If you don't worry about the emissions, I'd go with the Test pipe. (I had both but I have HFC on right now because of the turbo issues)

 

if you're ever going to get a 70mm exhaust, buy the 70mm hfc. otherwise, get the 60.