Here's a 350Z that came in to install some 3" intakes and a custom tune. This car gets tracked often and already had long tube headers, exhaust, and oil cooler. The oil cooler was in the way of the new intake routing, so we had to do quite a bit of work to make everything fit nicely. Then we put the car on the dyno and did a custom tune using UpRev software.
This is the most power I've seen out of an NA 350Z so far. And it was extremely consistent, actually picking up power as oil temperatures increased.
Here's the dyno chart:
And here are a couple pictures of the intakes installed:
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