I've had the z1 spacers and extended studs for about a year now, no issues whatsoever. Good quality, fast shipping and great customer service.
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2012 Z-SOLD
2014 Nismo #565 Fast Intentions CBE/HFC/Swift/SPC/RJM/H&R-15/20mm/Z1 CAI/Headers/Intake Manifold w/Uprev Tune 328.31whp/263.64tq
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