Stage 2 usually means the dump pipe and a CAI.
The real gains are from the dump pipe (after the initial tune which is, comparatively, where the massive gains are to be had).
I can recommend 42dd via forum sponsor Carformance.. brilliant quality, get it ceramic coated to finish it off. The dumps from SPM and Eurojet via Dub Addiction are also meant to be good units.
You can go catback on these systems as well, just depends on how much more noise you want, but there won't be any real performance gains from it. A good dump pipe will mate up to your stock catback and is a common choice on here.
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