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Message: [QUOTE="DarkSide2.6, post: 778019, member: 8142"] I'm not sure on the injection timing but the Sigma has 16mm plungers and can inject 1600cc of fuel at a much higher rate for higher RPM injection time (like 02BigD said) and the Billet Sigma has 17mm plungers and a custom grind cam. I believe the 16mm can support up to 1500hp and the 17mm can support over 2000hp. The pumps use larger injection lines than the P7100 to accomodate fuel volume and reducing the injection pulse. $10,000 for a Sigma and $15,000 for a Billet. Maybe someone else can chime in about the timing question. [/QUOTE]

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