Would it net any significant power/mpg gains? For 120$ I figured why not, but if it's not going to do anything, then forget about it. Also, what about megan racing drift spec catback, same question? With gas prices how they are, i'm considering doing everything I can to get MPG up.

 

the gains wont be too significant but they'll be enough to notice.

 

I'd go for it man, it can't hurt. Add an intake and a high flow cat to that equation and you'll feel noticable differences in throttle response and a slight increase in power.

Check the Product Review (6th gen) section if you'd like to hear what the car sounds like with the drift spec cat-back. I have it and love it. I need to take another clip tho, because it sounds a LOT different this summer since I changed gaskets and hardware.