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The '73.5 CIS is rather crude and typically swapped out for a -129 WUR and the switch eleminated. You really need the WUR/FD from a 3.0L engine for things to work well and support the power level.
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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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