I did. I have the FI 18" resonator CBE with carbon fiber mufflers. It's a noticeable kick with the butt dyno but nothing crazy. The FI exhaust will only yeild about 7-10hp over the NISMO. See, the FI exhuast on a regular Z is good for about 15-18hp while the NISMO exhaust is only good for about 7hp over a stock regular 370z. So it stands to reason that the FI exhaust on a NISMO 370z will only get you about 7-10hp. The car does pull stronger, especially in the mid and higher rpms. Thas what I noticed at least. And it sounds ten times better than the NISMO too.
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