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I love Russell's design. I've been mixing 100 and 91 octane to meet the tune of the SW chip I've run for years now. Having a fallback position to a 91 octane tune is great. Russell's and Steve's maps are somewhat different with SW's coming on stronger as you get in the 4K range. Russell's feels stronger low, but maybe gives up some on top end. Nothing scientific here in my assessment. I think they are both great products.
Oh, the anti-theft and valet features could be handy for some.
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Ed Hughes
2015 981 Cayman GTS
6 speed,Racing Yellow
Past:1984 911 Targa (Ruby), 1995 993C2 (Sapphire), 1991 928S4
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