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He's looking for 100hp/cyl. I'd be more inclined to go 1 3/4" primaries, even if he had to use a 1 5/8" step at the exhaust port.
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Choke point is the 35mm exhaust ports. Larger primaries would just create a lag monster.
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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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