I myself would love a set of Long tube headers because I personally feel the Z should be kept all motor and there are gains to be had for sure. However, like Jordo said I won't invest all that $$ into them until VVEL can be tuned. When the VVEL can be cracked, I think 340-350 whp with full bolt-ons will be commonplace. Which, again, with an N/A set-up presumable revving to nearly 8000 rpm will be awesome.
And Jordo is also correct in terms of needing an ecu tune to optimize headers. I forget which dyno it was but the addition of LTH without a tune caused some low-mid range torque loss because the AFR was really rich. Also you'd want to raise redline a bit as you would be making power the higher you go in the RPM's.
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K&N // GTM // BERK
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