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You are down on power. The ARFs look typical for old stock WUR. Safe but not optimal. What do you mean by B&B exhaust? Headers, muffler, both? Are you still running a cat? Graph looks like you've got a cork in it.
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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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