Hello, another long project has finally come to an end: we've installed a dual exhaust system. The attempt to use a muffler from a 350Z didn’t quite pan out; we only ended up using the tips. 
The actual muffler is from a Ford Kuga. The sound hasn’t changed much, but the appearance now resembles that of a Juke Nismo. If you're worried about the unevenness in the diffuser, it won't be noticeable soon—those are just marks from the faux-exhaust.

Yes, the wheels are in place: I opted for Hankook Ventus Evo tires, the grip is incredible, and I'm very satisfied with my choice. As expected, there was no issue with the fit; everything looks perfectly aligned.