Hello all!
recently had some issues with my exhaust and just decided to pull the trigger on a aftermarket exhaust the problem is i dont know which one to get.
the top three are
1. Nismo S tune( love the sound but i heard there is no power gained from it)
2. invidia (Cat-back exhaust)
3. Stillen( still debating about this one since i heard it rust real bad)
Nismo S-tune exhaust on 350z = 6 HP and 3.5 lb-ft gain to rear wheels, 9 lbs lighter than stock (vs 350z exhaust). Who knows on the FX, but I would think you would gain at least some hp. You are going from a 2.5" diameter exhaust to 3.0" diameter exhaust.
I would say this is the best sound exhaust.
Invidia, true dual, cat-back exhaust. 2.36" diameter exhaust, they went smaller than OEM, which is smart, because you won't lose back pressure, and with true dual, your restriction is less. With this system, you should gain the most HP or equal with Stillen.
Stillen, second best sounding, but probably the cheapest type 304 stainless steel we have seen... It just looks really bad, I wouldn't get it. If it was similar in cost to Invidia, maybe, but it's around $1,300!
Don't count out HKS. It is between the Nismo and OEM in terms of sound, but HP gains I believe were more than the NISMO (or at least what the HKS USA office told me -- and they just removed their number for the public to call.... that sucks).
Most like the NISMO though because you retain the "exotic" tone of the stock exhaust, just LOUDER.