running on apr stage 2 now, i can def feel the flatten torque slightly after 5000rpm... is it normal? when i scan the car, it stated 'fuel pressure unspicified'

not sure if it is cause by boost drop, leak or lower back pressure (just installed apr exhaust) as i do not have a boost gauge.

going to dyno to find out whats wrong tomorrow. so wondering whats the normal boost level and hp i should be expecting for stage 2.

apr97 stage 2, carbonio, apr exhaust, spint booster.

TIA