are exhausts measured from inside or the outside???
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Car Info: 05 wrx wagon
are exhausts measured from inside or the outside???
i was wondering how exhausts are measured because the exhaust i was looking at(tanabe ultra) is supposedly 3.175" or so....a little bigger than 3. When i measured the across the inside, the actual width of the inside is only 2.75'' , and the width of the wholeoutside was like 3.1 something. I was guessing when they say 3'' exhaust, that thats the width of the inside of the pipe? If so, i guess the tanabe ultra im looking at is a 2.75'' which would be good for me. Ok right on..
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