here is another bov from aus the guys will change the spring to a lighter one so it acts as a bypass
scroll down the web page for sound files
http://gfb.com.au/products/blow-off-...9289514-by-gfb
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370z Stillen SC 9lb pulley Uprev Tune Z1 Oil Cooler Hi Tech CB JBT BBK JBT Rotors White Line Sway Bars Swift Springs
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