I do not have a pre header tune...I was Hoping for 330, it was my goal, however with talking with Vince he said the only ones that dyno higher for them are the ones with long tubes, I did not think there would be that much of a difference between these and long tubes...My torque I though was quite good. I have takeda long tube intakes, the z1 headers, motordyne art pipes and fast intentions exhaust. and M370 manifold. I looked through rt's tuning videos, most of the 370z first pull was average of 300, so I based a tad higher, and most they said were high teens in the 300s...I might also hit a local dyno(they do not tune) and see if I get similar results, every dyno is different, but I can tell you I felt butt dyno results with install of the headers, so regardless of the numbers my feel is they are worth it, and I plan on supercharging in the next year, and the stock header design is restrictive.
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