Posted on August 11, 2016 May 29, 2018 by FiTech EFI Do I need a CDI box to control timing? No you do not. Our ECU can drive your coil directly, BUT it can also fire a CDI box if you have one or wish to use one. Post navigationPrevious post: Can I use the Power Adder #30004 if I’m not running boost or nitrous yet? But planning a future upgrade?Next post: Do I need a laptop to tune the Go EFI fuel injection?