| are going to be the amount of money you spend ( Doolz setup is cheaper - don't need 2nd MAF and don't need AFC ) vs easy of troubleshooting issues ( mixed A/F ratios - both banks receive the same amount of metered air with doolz system for example ) .... also - piggy back ecu management is not superior to having a programed ECU ( JWT cost more than Ash Spec or Z1 ) at the end of the day - power wise they are about the same give or take 10rwhp and it boils down to preference and $$$
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