You probably could make 300hp on the stock lp but the question is how long will it last. With your pump tuned up and those injectors I would also suggest a GDS 60mm compressor upgrade for your turbo so you can burn all that fuel better.
I take it you already have gauges?... you will definitely need to keep an eye on those EGT's.
It'd do. Especially if you don't want to go any higher in the horsepower ratings or want to be dependent on nitrous when you do.
A lift pump is definitely required to "do it right". On a dyno, when you only need to make power for about half a second, you can make numbers while taking a lot of shortcuts. But after a couple seconds that lift pump will be very beneficial, and you're definitely not doing the injection pump any favors running it turned up with the stock pump.
to put in in perspective ive got only a couple things like fuel screw maxxed a fuel pin turbo and a straight pipe exaust and i make 235hp 601 tq so with injectors should be possible
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