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I haven't done this to my own car but many of my colleagues have. It's not something I would do as a stand-alone but would consider it if the heads were already off.
The benefit for a mild 930 would be driveability, or a more smooth running engine. I would expect zero HP gains and minuscule torque gains. Added protection against detonation is a plus.
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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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