Throttle body probably needs re-soldering, mine was the same when I got it, does it run rough low in the rev range? there's a DIY on here on how to do it.
Your gonna plasti dip the whole car?
Youd nearly be on par with a respray doller wise lol, that **** is exy as, 30 a can or something!
Also, get the pod closer to the grille, less hot air that way, or box the pod where it is
If you want any s13 parts, I got a garage roof full of them, had s13 drift pigs since I got my license, got over the defects from Newcastle HWP so sold it.