400 RWHP stock turbos?? 400 at the engine is about 320-350 @ the wheel. At low to mid 300s, you might be ok with stock injectors but recommend to go bigger..
400 RWHP, I say its not good to try with stock twins. You could go with BNR stage 3 (BNR is local) or go single. But not with stock turbos.. Also, you would need a good tune when you get injectors swapped.. Good thing if you get this done within few weeks.. as Ray from PFS is coming down for a tuning day (huntsville, cost anywhere from $400-800 pending dyno time).
I have some 1300s for sale or you could go 4 x 850s (I have 850s also).
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