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No.
Stock engines are done at 5500rpm, one reason for the long-geared 930 tranny. I don't think that changed until the K27 was used in the 965.
Try to find others who have stock cars and get their impressions. You could very well have a small issue robbing your power, it's hard to say from a few typed words.
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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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