Hello,
We at AAM been using 200 cell HFc on Multiple 350Zs, G35s, G37s and now few 370Zs. We have not had any problems with our HFC throwing CEL codes.
Check out our site,
AAM, HKS, Greddy, TEIN, ARC, JWT, Eneos, Volk Racing, Carbonetic, Motul
and also search toohip on this site, he has our exhaust and HFC on his 370Z.
Hope this helped.
Thank you!
-Jae