as title really

borrowing a firends saf at the min but im a bit concerned on the lag, off boost its quite flat and ill have to wait about 20-30 seconds for boost to come in and about 5 secs for it to get off vacumn to go to zero on boost gauge

spec is std engine as far as i know, t34 with .48 ex housing
500 interocoler, exhaust, greens, live map etc, usual stage 3

just wondering if anyone can give me some ideas on what to check for that would cause this lag as it should be at least half as my old cossie was no where near this amount and i was on low comp and a igger ex housing

or could it be how the turbo is built?