6.9 exhaust

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Oversize

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This was based on a minimum ID of 40.5mm (1.59”) for the 560. Minimum ID of 41.5mm (1.63”) for the 6.9.
 

Oversize

Master
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I was speaking to a mate who races a 450SE & his mods have been recommended by a well known racing team in V8SC. They specified an OD of 1 7/8” (47.63mm) and a minimum primary length of no less than 28” (711.2mm)!! Of course that’s in an ideal world with no space limitations.... So based on a wall thickness of 2mm that leaves an ID of 43.63mm. Not far off my calculations which were minimum sizes not taking into consideration size availability....
 

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