You need to go for JPJ, ask them for the facelift or front face convertions paper agreement. Around rm30-50... depends ones..
Any bad asshole there won't simply tell you this, but actually u can request for the paper. I have friend who has an AE111 then converted to Carib head. And he got lucky because there is a superior there willingly to tell him about this.
So now, he just bring his paper (photocopy) version at his car.. in case any JPJ block him. he can just show them the letter. :) but please bare in mind...
Some car were born with a hole under their front hood following by the engine series(etc turbo)... while some are illegal... So don't go too far limit here... etc, MY car is NA but i use SUBARU scoop as to cold down the engine, then i add fins on my fender there to allow the car to have better air circulations. That is something which i said rojak and JPJ even got letter also won't permit you to have green light for it.
:)
Good luck with your inspections. :) Just talk nicely, once you got the letter. You can just lekat the paper into those asshole's face who block u. ^-^