you'll want to make everything 1/2" if possible to reduce flow restriction. In the case of the pump inlet and res you wanna make that as big as possible as restricting the inlet of the 1250 has proven to halve it's performance (or there abouts). The BIM2 performs terribly, especially when compared to the BIX. Either go for the both, or just the BIX. Preferably two BIX but definitely not the BIM2.
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Meethoss
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