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HOW MUCH Power Do Headers Make On The 370Z and G37?

In this video I look at some testing I have done on header swaps on various G37s and 370Zs. One of the cars is a Nismo 370Z that made 333whp/271wtq on this Dynojet after switching from stock headers, to Z1 headers, and retuning. This gave a total gain of 18whp/11wtq over the stock headers we used on his previous tune (315whp/259wtq). We saw an average of 16whp peak gain and 11wtq peak gain with gains everywhere on the powerband on the various cars we tested with. On my own G37 which uses JWT C2 exhaust cams, switching from stock headers to Tomei headers picked up a stellar 19whp with substantial gains throughout the powerband.