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Old 04-12-2019, 12:20 AM   #18
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Join Date: May 2015
Location: Swampscott, MA

2.5mm works great in an N/A application. Most I've read about is something like 3-4mm, but I won't speak on anything I don't have personal experience with.
1993 944 B230FT/M90 thread here:
1991 245 B230FNA/M47 no thread: secret LeMons car technology abounds
1991 245 B230F/M47 no thread: very boring (320k!)
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