Z already had the Nismo CAI and Kinetix HF Cats. I just added the Injen SES exhaust. As anticipated, I did notice a slight loss at the bottom. Does the ECU eventually compensate? If not, does the Techno reflash smooth things out down low?

 

Bump

 

The only way to know for sure is if you do a dyno to see where your hp and a/f ratios are before and after the mods. I did not need the ECU flash with my mods, and although I did not dyno before the mods, my hp and a/f ratio after the mods looks good (in my sig).