i gained 16whp and 3wtq with my z1 headers.. i already had full exhaust and HFC before i installed them..
Baseline no tune
291whp and 233wtq
after header install only no tune
307whp and 236wtq
tuned i made 310whp and 240wtq
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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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