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thats what i thought
 

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yes it looks like SPI its popular among with Cudney pistons as well, but hey that 3rd picture looks like it got pierced or something? or thats normal shaping ?
 

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spi same style i just put in my switchback and buddies ultra

cheers
 

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Those are deffinently spi's. I have 2 of em sitting in my basement right now I plan on putting in tomorrow. I can take a pic of mine if you want but they are IDENTICAL. Only thing different is I have to tiny holes drilled under the rings to lubricate the exaust something or other. Those are expensive to, did you just find em laying around or what?
 
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