hesitation or flat

Hello everyone! I've got 1.8t 20v Leon - APP engine with K04 hybrid turbo from S3, intercoolers from cupra R, 386cc injectors, coils from 2.0tfsi, forge DV, TIP, 3 inch downpipe..no cat etc.. Bought the car with remap - don't know which one. The problem I have is that whenever I go full throttle...

Hi being new to the 03 Seat Leon 20v turbo cupra we have just bought I wondered if there are any known faults which cause a hesitation/flat spot when accelerating from start or low speed in low gears namely 1st and 2nd?? The car is awesome and has full leather electric seats and climate...