Thread: Project 60/60 Xfi Metro and Singh grooves
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Old 09-05-2008, 11:36 AM   #6 (permalink)
Daox
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I think the grooves are a great idea. I have heard very good things about them from very knowledgable engine builders. I can't answer your question about why OEMs haven't caught on. It does say he has patented it though.
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