Quick DC Sport Header question

[SeriousBlack]

Hi all - visiting Portland and thinking of picking up the DC Sport Headers. I've tried to check all posts/stickies but need some quick feedback on whether it's a go or a no. Since they've been around for a while, I'm interested in hearing from those who have had them on for over a year or two.

For the time being I'm running a stock exhaust but will probably go with a cat back mod later.

1) Performance Difference (Torque/HP)?
2) MPG difference?
3) Any downside or better product?

Thanks guys!