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Tricky thing to search, forum and google search has given exactly zero answers..

Adding a trans oil cooler, tapped into the OE cooler hoses (upper/lower? Opinions?). I need the inner diameter of the OE hoses, to get the right barbed to AN fitting from my local stealer. Anyone done this, or have discarded hoses they can cut and measure?
 

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3/8" hose
I think I used the same size barb. But I just went to home depot and looked for the couplings.



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Awesome, thanks. I've gotten mixed messages, but 3/8" or 10mm seems to be the prevailing answer
I used a 3/8" Magnefine for my '01, worked perfectly. I had the same fun doing the search, but came to the same conclusion you did.
 

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Yep, even had a local dude here on Facebook go out and cut up some lines he had laying around. 10mm ID, or about 3/8 freedom units.
Yea, it probably is actually 10mm given it's a Euro car. Close enough to not matter with barbs though :)
 
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