The exhaust side is spoken for and all I can say is that there's a considerable amount of deliberation that has gone through my mind in choosing which is appropriate. Rogue Engineering was my first stop as well (hearing the youtube videos and so on) and then I realized that it may not be exactly what I was looking for.
As for the intake, I've installed the aFe on my personal MC and I can't get enough of it. It's a world of difference and a solid starting place if you're looking to get more sound out of your Z. Also a very simple DIY project if you're up to it.
Gruppe M is something I haven't heard in person but the aFe is something I can attest to personally.
OH and welcome
