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If you have a legitimate need for port injection you're already spending quite a lot of money on parts labor and tuning. People are making more than double stock power with the stock DI.
Don't fuck it up by doing anything less than the right way. If you don't use one injector per runner you will have inconsistent fueling across your cylinders. If you use a JB4...well, if you do that you probably deserve whatever happens.
At the VERY least you will need a system that reads fueling directly from the DME with no lag. This is not that simple of a matter because not only do you have the on time for the injectors but you have rail pressure as well. A JB4 or other piggyback will not do this.
Really, if you have a *legitimate* need for port injection (and keep in mind people have made quite a shitload of power with DI) you might as well just run a standalone ECU and ditch the DI fueling. Also are you SURE you need port fueling? What kind of power goals do you have?
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