Originally Posted by QVu

Overall drivability is noticeably MUCH better/smoother. It's much more responsive than before. There was an increase in power throughout the RPMs. The car just seems "healthier" than it was before the tune with the bolt-ons on. According to Sebs, the Nismos run leaner to begin with, and with the bolt-ons you can see in the baseline run that the car was runnin way toooo lean. I went in to the shop originally to get the car checked out because the car seems to labor more than usual driving in 5th and 6th after installing those parts.

I would definitely get the tune done if you have made those basic breather mods, or just have the ratios checked to be safe.