Those with Z1 headers
I'm looking for answers with those that have Z1 headers installed
what kind of gains did you see from them
and if you had to do it over again would you get them again..
on the fence about getting them and just want to hear what you
think about them
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Tuned by (Seb@Specialty-Z)
2011 G37 Cam'd FBO 347whp 280wtq Corn Fed 4.08 Gears
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