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There's two engines the R33 GTS non-turbo can come with. The RB20E or the RB25DE.
Either way, there's no realistic mods that can be done to make it competitive with the turbo models. There are mods that will help it run a bit better though.
The ones like you mentioned, there are headers available. Of course the 'racing use only' de-cat pipe and then a catback exhaust. There's the street use cat back (has the required pre-muffler) or the one like GP Sports makes for 'race use only' without the pre-muffler. Also, install an open air intake. Getting deeper, he can install uprated cam shafts.
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1990 Skyline GTE/S-t 4 Door Updated 6 Mar
Swapped out RB20E with RB20DET
Trans converted from Auto to 5-Speed...
Now with SR20DET 5-Speed
Installed Type M 5-lugs and brakes, R32 GTR rims and 2-Dr rear end (Tail lights & bumper)
1994 Isuzu AMU
US Spec Amigo with JDM Isuzu MU (Mysterious Utility, as it's called in Japan) nurf bars and hatchback style hardtop.
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