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Many plug numbers are no longer available as companies have consolidated them into groups. Numbers that come up when you cross reference are not necessarily an identical match but very close.
Your environment should be taken into consideration when choosing a plug for the 930. The cold W3DPO will work better to reduce knock in a very hot climate and a hotter plug will work better to resist fowling in a more mild climate. For track cars a cold plug is better.
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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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