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Old 11-15-2010, 05:52 PM   #5
ER70S-2
Beastly Adventurer
 
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Joined: Sep 2009
Location: SE Denver-ish
Oddometer: 3,995
Stock exhaust dimensions:

Inlet: ID = 1.4"; OD = 1.51"

Outlet: ID = 1.135"; OD = 1.265"

If they removed the stock inner tube (the one that sticks out about 1/4"), when gutted, that will leave a hole; ID about 1.386"

FMF Model #S9000 Approved Spark Arrestor (thanks to mx_rob)(also available at Dennis Kirk, I think), is 1.650" OD and 3.38" long

For reference the GSXR muffler x40F0x outlet; ID is 1.680"

GSXR install (again thanks to mx-rob):
https://docs.google.com/present/view...c203OWhm&hl=en
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