STR INTAKE MANIFOLD
3" Full exhaust
2.5 " test pipe
AFTER INSTALLING THESE this is what happened

here is the question more detailed:
Say when i am cruising in 5th gear and later want to down shift to third and accelerate, may car pauses or hessstiates and makes a werid misfire sound around 5500 rpm, but right after it does that for few seonds it picks up all its power and goes to redline with ease. What i think the problem might be is my ignition but i reallly dont know, i heard honda stock ingnaitons will do the job.

here is my engine management setup:

B18c1 (bulit)
turbo
Grerddy fmu
VAFC - settings from 4500rmp after +25 to +30 (both high and low)
310 cc
stock map
boost at .68 bar
walrbo pump
FPR set at 4.1 bar and under boost 5.3 Bar
air fuel reading at redline 10.3 or so
IGN stock