I think the "mini tub tanks" are only necessary when running leafs. That's because the leafs get moved in and intrude into the area occupied by the stock tank. It could also be helpful for exhaust clearance though. All of these 3 popular suspension options have crossmembers, coilovers, etc behind the axle which can complicate exhaust routing if using larger tubing.
BTW, I believe there are some non stainless mini tub style tanks available in the aftermarket. Maybe Spectra makes one? Not sure about that though.
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John
'71 Nova ( Build thread)
FFR Roadster
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