Edited the brief descriptions of Parts III and IV to further clarify their improvements and importance as a whole. Seriously, it'd almost be a sin not to do those two parts if you've done Parts I & II already, I cannot state enough just how much the latter 2 parts, especially the velour top mod, improve the sound.
Omfg man, thanks alot for this guide!
Just did the core mod +back-vent mod, took me forever cuz I have really shaky hands
and I had no tape so I had to be creative and use other stuff
I will probably do the other two mods tomorrow.
The sound got ALOT better and the comfort improved as well.
Way more airy and harder hitting sub bas.
Thanks for having faith and trying out the mod; if you don't have tape it might be tough to do Parts III and IV though. Maybe you can sew instead of tape for Part III, but I don't see how you can achieve Part IV without double-sided tape...some sort of glue maybe (that might be messy)?