Hey - firstly kudo's for picking up a great car!! Maybe i'm biased cause i own an ek civic hatch but hey, 4.5k for a minty ek . . SICK!

If you're chasing speed without spending a great deal of paper, look for the easy options. When i got mine, i just wanted to match my mates B16a but there was no chance. So whilst i saved and waited for the motor swap i updated a heap of ish that gave the feeling of more speed. Things like an air intake, uber sticky tyres to hang round bends at high speeds, bigger brakes/booster, short shift etc plus to make sure i didn't get bummed with no visual progress i tinted the windows like ctx said too. Also, it may sound weird but polish the balls outta it. Makes a huge visual impact and dust and wind will slide right by, F1 cars do it for speed so it must work

Anyways, hope this helps!!!