its all depends on how loud you want it. The 18" resonators in the x pipe is the dullest, 12" middle of the road and the non resonated the loudest. (when i say dullest, the sound is still exotic and amazing just not as loud comparatively to the others) The resonators dont affect the performance characteristics of the exhaust at all, they will all still perform the same, no restriction what so ever.
The Nismo in my mind is a waste of money, You can get way nicer body kits and just as much power with aftermarket part. I would personally go with the sport pack but thats just me.
Intakes are 50/50, i think most of us here are using Injen or Stillen. There's a ton of threads about intakes floating around this forum. You'll find plenty of info on the specifics. I had Stillen Gen 3's in my G37 and now i have the Injen's in my Z.
Overall, i would give Tony or Blake a shout over at Fast Intentions. They're super easy to work with and extremely knowledgeable. They can help you pick out the exhaust best for you and explain every detail you'd want to know about them
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11 SR 370Z Sport 6MT - Sold
03 Escalade AWD - Sold
13 Silverado LTZ Z71 Crew Cab
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