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fuel
When im at wide open throttle right before I shift I notice my fuel pressure starting to fall! The car is 93 5.0 paxton sn 2000 8 lbs boost, mallory fuel pressure reg edelbrock performer heads, motorsport f303 cam, gt40 upper& lower intake 36lb accel injectors prom75mm m.a.f calibrated, 255lph in tank pump. Stock fuel rails, stock fuel lines from tank to fuel rail. Why is the pressure falling???
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Generally speaking (because i'm not a mustang guy with knowledge of your specific parts), when you are getting ready to shift, at high rpm, wide open throttle, making boost, you are using fuel at the highest rate your car ever experiences. You need more pump.