The next mod that was just done a few weeks ago is RHFC install (installed at 12,500~ miles). I bought mine from fast intentions at the same time I bought my Motordyne exhaust but it took a while to get them just because of the long turn around times. This mod IMHO has made the biggest difference power wise. I feel more so than my exhaust did. Maybe it's just because I have two breather mods now but the car pulls much harder and throttle response is better. I am for sure glad I went resonated because it does drone more. It's not bad at highway speeds but in some RPM ranges it can be a little annoying. I went HFC instead of test pipes just because I didn't want it too loud. I know everyone says get the ART pipes and even though I don't have to deal with emissions testing I just didn't want test pipes personal preference. I don't have pics of the RHFC but I did take a pic of my old cats (the weight saving alone on those is decent). I did take a video of it below: