What are you guy's thoughts on the Piggyback ECU from RaceChip for the X50? I heard that it really has some significant increase in power after installation, but is it really worth it for 3599 for the GTS series?

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What are you guy's thoughts on the Piggyback ECU from RaceChip for the X50? I heard that it really has some significant increase in power after installation, but is it really worth it for 3599 for the GTS series?