Id say ported headers and up-pipe too.
i found that my turbo waste gate was worn and causing my lag on a td05,
a decated system and filter should help spool up, but then a fmic will add the lag.
To help diagnose couple qustions>
how are you controling the boost and what amount of boost you runing?
if you have a boost gauge at what rpm do you reach max boost pressure? (ie. 1bar at 3k)
a td04 will not give you the power your aiming for.
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