Screwing around youtube, and I stumbled upon this video on youtube, looks like kind of a redneck guy who wheels the crap out of his rig, and does very ghetto modifications to marginally increase power, while doing it cheaply (I mean, he has pacesetter headers, lol).
I've googled some of his mods, like pcv inline catch (Mine was already converted to a breather with a filter), throttle body coolant passthrough bypass (some guy on a mazda forum was a physicist and calculated it in his post and determined only a .13% hp increase), and ect mod (seems like it's throw all sorts of codes and just not be a good idea in the long run).
THE IMPORTANT PART OF THIS POST:
What stood out to me is the Balance shaft delete. After googling and Wiki-ing, it seems like just a ride comfort thing, and removing it would add around 5hp. LC Engineering makes a delete kit for $100, so I more or less know it is a legitimate mod, as I trust LCE.
Has anybody tried this? Heard any bad things...good things...? Not much coverage on the internet about balance shaft deletes, as it is only a 4 cylinder thing.