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KyleMaras7.3LPowerstroke
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19 Posts
Discussion Starter #1
What sizes are the stock up pipes? Is there something inside them cause on some there is like an expansion chamber lookin thingy? What sizes can you upgrade to? Is there 4"? And why are the upgraded ones so expensize? Seen some for $850 bucks!!!!!????? What is so special about them????
 
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