Outer Limits 4x4 Board

Hey Guys
I have recently upgraded exhaust and fitted a snorkel to 03 TD courier. Should I now have the vehicle in to be retuned to allow for the increased air flow? it doesnt seem to have an engine control unit. As it is my first diesel I am not too sure on how it all works yet.
Cheers

being that it's the old 2.5l it's only a mechanicle injection motor and has no ecu or computor.

there is no need to retune ur engine once a biger exhoust is added. though if ur chasing more power u can turn up ur fuel and boost a tad.