There is 5.75" of front spacing available on the rear of a 930 with no spacers, and about 6.75" of back spacing. If you are using anything less than an 11.5" wide wheel (which takes up 12.5" of space) the front spacing is all you need to be concerned with in order to push the wheel out so that a tire correctly sized for the wheel will sit flush under the lip of the flair.
Here is an example:
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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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