I'll make it more clear this time
I have a G35C. 3.5L V6 with bolt-ons. OEM Spec: 280hp. With Bolt-ons, I estimated to around 240+whp.
Doing 2.5" true dual header back (2.5" piping per 3cyl).
This setup is to be future proof for FI (~400whp MAX). So 2.5" per pipe should be efficient. I've seen peole making around the same power on similar setup or worse (Stillen y-pipe) which is smaller piping size.





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