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JDM cat won't bolt up to stock usdm midpipe. It's 6 inches shorter and it doesn't have a secondary O2 bung.
To make it bolt on you need to fab up and extention with an O2 bung.
98spec header > JDM cat> extention with O2 bung > stock length usdm mid pipe with 2.5in collector > stock axle back or spoon N1 depending on mood.
I'd rather run stock exhaust then yonaka catback. Personal preference ..
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