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Steel washers have crush when you stack them. It takes several washers to make up 3/8", when you tighten all of that there is a lot of movement available for vibration to loosen up. Copper nuts should stop that from happening.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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