You figure it up. 2.25"/2 (radius)= 1.125" X 1.125" (squared)= 1.265265 X 3.1416 (pi)= 3.976 sq. in area cross section
2.5"/2 (radius)= 1.25" X 1.25" (squared)=1.5625 X 3.1416 (pi)= 4.90875 sq. in. cross section. (NOT diameter).
1.5/2 (radius)= 0.75" X 0.75" (squared)= 0.5625" X 3.1416 (pi) = 1.76715 sq. in. cross section X 2 (two pipes)= 3.5343 sq. in. cross section total.
I really wonder if that 1.5" twin pipe figure is correct.....
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Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMWCCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?
