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  1. #1

    Riva metal thru hull exhaust

    Just got my Riva metal thru hull exhaust to replace the Riva plastic exhaust. Noticed the inside diameter of the metal pipe is larger than the plastic pipe. 16.5% more free area to be exact. Should flow a bit better! Anyone know if the exhaust sounds different with the metal pipe vs. the plastic one?

  2. #2
    Site Admin Green Hulk's Avatar
    Join Date
    Apr 2005
    Morgan City, LA
    The exhaust sounds the same. Its also worth noting that the Riva aluminum plumbing for the IC also has a larger ID than the old plastic pluming and i recorded a .4 PSI increase in boost just from switching to the aluminum plumbing

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