Originally Posted by 2sl0w

Mike has and other cars have gotten within the range as well. It is not just the headers in that package that make more power... The modified plenum is crucial.

Z1 used their intake (which is similar to a gen 3) and a tomei single exhaust + test pipes. If you have gen 3 or equivalent with a High flow exhaust the 400hp package works as advertised.

With just the headers and a tune from someone other than z1 you are right... cars haven't been hitting 340+. But they don't have the manifold or a Jon Parham tune LoL.

And as far as the accuracy of z1's dyno ... I doubt there is a dyno out there that has run more 370z's. They have a wide range of results and would not market their kit at 400 crank HP if they weren't ready to stand behind it.


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