Finally got my Brullen cat-back and downpipe installed. Holy @#$& is this thing awesome!! The sound is absolutely perfect...no too annoying at highway speeds but it definately sounds mean...nice low throaty tone you can expect out of a WRX. I went with the dual 3 1/2" tips...looks beautiful, wish I had a digital camera to show pics. I got the HKS bov on today too, nice whistle too it, not very annoying. I've heard the GFB which has more of a whoosh sound to it but the HKS looks to me like a better product. Either way I'm extremely happy right now and highly reccomend everything.