Holley 160 GPH Dominator In-Line Billet Fuel Pump SFI 3.3 which gives you a bit

which gives you a bit better idea what they are

When tuning an engine using wideband AFR feedback control on an inertia dyno

A5 Cabriolet

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Note that sometimes this material is referred to as "fireproof

Holley 160 GPH Dominator In-Line Billet Fuel Pump SFI 3.3 which gives you a bitNeed to feed some serious horsepower? Have a nitrous or forced induction powerplant that also sees street duty? Holley's Dominator in line fuel pumps are the answer! The patent pending twin pump design allows you to use one pump for cruising and both pumps when you activate the nitrous switch or start building boost! By staging the second pump, you eliminate the unnecessary recirculation and heating of extra fuel which can lead to poor performance and