As I have mentioned earlier, as you do jobs for the Yakuza and Triads, you will earn faction points. In addition a variety of good loot pieces, you once you earn a trusted reputation (700 or higher faction points), you will be able to earn faction-specific businesses, the Gun Running Operation (Yakuza) and the Yaa Baa Parlor (Triads).
Unlike normal businesses, these business produce boosts rather than money. This system is a lot like the politico corrupto in Mafia Wars Cuba; you can not upgrade the quality of the boost, but rather the capacity (amount of boosts the business can hold) and the output (the amount of boosts produced every 3 hours).
With that said, here are the businesses, the requirements, and the outputs:
By earning 700 or more reputation points with the Yakuza, you can buy the Gun Running Operation for B$300,000:
The Gun Running Operation produces Black Market Ammo (+32 attack skill) boosts every 3 hours. It starts out producing 1 every 3 hours, but can be upgraded to 5 every 3 hours.
By earning 700 or more reputation with the Triads, you can buy the Yaa Baa Parlor for B$300,000:
The Yaa Baa Parlor produces Hyper Alert Sentry (+32 fight defense skill) boosts every 3 hours. It starts out producing 1 boost every 3 hours but can be upgraded to 5 boosts every 3 hours.
You can get both businesses, in fact, it is rather easy to max out both factions, just follow the information in my previous faction guide post.
Fully upgraded, you can collect an extra 80 boosts per day (10 every 3 hours). Not too bad at all!