This is what we had on our b18c7 to achieve a 13.6@101MPH

DynoDave custom headers - $1.2k
2.5 inch exhaust with xforce CAT - $700
Hondata and tune - $1100
Intake - $300

We made 127kw with these bolt-on mods for a stock type R motor.

All these bolt on mods will set you back 2.5k. You got another 3.5k to play with. This is what i reckon you should get with the 3.5k

Ported head $1000 (dynodave)
Decent Coilovers $1200 ish
Good rubber - $300
ITR gearbox - $1500 ish (if you can find one)

You'll be set to run 13's all day long