Happy new year all. I've been a member for about 20 minutes now. My 06 wagon is 4 months old and i'm going to start mods pretty soon. I've tried to research as much as possible before i post. Going to upgrade to stage 2. Cobb AP,K/N drop in, and Turbo back. Narrowed it down to either APS 3" or Helix catted down with Greddy evo2 catback. I can save like 500 bucks by doing the helix and catback. Wondering if there is some kind of forum where i can go to hear the differences in sound between the two systems or just general knowledge about them. Thanks.