2001 CL-S Exhaust size
#6
There doesn't seem to be a definitive answer here unless it was in the links that no longer work. The piping from the cat to the y for the mufflers is 2 1/8" OD so the ID would be 2" or a little less. The piping from the Y is... very small. I didn't measure that but I'd estimate 1.5" OD.
#9
Transmission Pro
If you look at the parts catalog for the CL, and find the gasket that goes between the exhaust header and the exhaust, the part description will tell you the size in mm.
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