[kern417]

Just wanted to add that port injection, whether it's in the charge pipe or in the actual intake ports, will pretty much have unlimited headroom. At that time, you can simply swap in a walbro inline pump(s) and daisy chain injectors as needed, as long as space allows it. A larger HPFP will still hit a limit with the OEM injectors. They can only flow so much. But for port injection, you can swap as many 1000+ cc injectors as you want to make more fuel. And they are cheap, universal components.

So again, using these are not as ideal and clean as upgrading the stock system. But most tuners know that it's too easy to run into another wall going that route, and it gets way more expensive quickly without the room to upgrade easily. Aux fueling just makes more sense.