3" Cat/exhaust --> Inside Or Outside Diameter?

WazR32GTSt · 2006-03-24T08:20:47+0000

wondering about a 3" piece of pipe, say in a cat or exhaust... is 3" the internal pipe diameter or the diameter of the outside of the pipe? i thought GTR cats were 3", but went to look at one today to find the internal diameter was just over 2.5" around the pipe that attaches to the flanges... i immediately thought this was too small for my 3" exhaust... but then i thought maybe this was normal as the outside of the pipe was the 3" diameter, and the insideis just that little bit smaller? cheers, Warren

By WazR32GTSt,
March 24, 2006 in Engines & Forced Induction

https://www.sau.com.au/forums/topic/110952-3-catexhaust-inside-or-outside-diameter/

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