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RarlyL8 RarlyL8 is offline
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,423
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Primary/secondary optimum size depends on a lot of things. Most importantly how much air will blow through the engine; boost level, redline RPM and anticipated HP at xRPM. Displacement is much less a factor than these others.
You need to match your exhaust port size so if you use the GSF take the time to cone the gasket protectors so you have smooth transition from the heads to the primaries.
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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
Old 03-16-2010, 08:03 PM
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