The idea of the systemcooling mod is to improve performance by 1-2 degree C by a simple $5 mod. DDC lacks flow rate and the mod on the DDC would give it extra flow rate. This gives it the same performance as a DD5 or 150z. DDC biggest asset is low noise for performance. Mod makes it untouchable in that department.
With the mod you would get the same performance as that dual DDC setup but it cost extra $80 and cost of that plexitop= $40 (estimate). There is a single pump plexitop with the the straight outlet. Looks better than the $5 mod and you get the same performance.
BTW. Most people don't have setups restrictive enough to benefit from running at 13.5 V's or dual pump setups.
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