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I have an aux pump and a LT4 in-pump. I have my aux pump running on a boost reference. I like the concept of an aux but I also like boost a pumps. They both have their place. If you are running some boost (8-12) pounds, some nitrous (100 shot), some ethanol (50%), then you may be able to get by with just a boost a pump. But when you start running more boost, more nitrous, higher ethanol content you may need to add a second pump.
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