dssur
+1y
1st: It doesnt matter if you dont want "side to side", your axle needs to articulate over bumps or when pulling in a sloped driveway. If you two link it, and the right wheel runs over a bump, the left wheel will hop. If you pull into a slanted driveway, the outside wheel will come off the ground and you will be stuck because mazdas have open rear axles. (the lifted wheel will just spin, the one on the ground will do nothing)
2nd: The pinion angle will only be right in one spot. If you set it right at ride height, it will be wrong at full drop. If you set it right at full drop, it will be wrong at ride height. If you set it at either of those, forget about lifting all the way up, it will be wrong. Its because the two link makes the axle follow an arc, with a 3 or 4 link the upper and lower bars work together to hold the pinion angle.
3rd: when you use a two link, usually you want the front mounting position to be at about the middle of the range of lift/drop. If you use the factory perches, it will be really low. This means the axle is going to move back and forth (closer/further from the trans) a lot as it goes up and down, and the wheel will move back and forth in the wheelwell and not be centered. It also means the driveshaft will be moving back and forth that same amount, which plays hell with the carrier bearing. Because the mazda leaf perches are so close to the axle, the links will be really short, wheich means this problem will be worse.
4th: On a mazda, the front leaf perches hang lower than the frame, so your two link bars will too. You wont lay out, and if you drag you will drag two link bars.
My personal opinion is that two link users are lazy. That doesnt have anything to do with what I just said above though. I gave you very salient reasons why you shouldnt. If you are taking the time to do it, my opinion is also that you should do it right. Moving the gas tank is a walk in the park compared to bagging a truck, I dont really understand why everyone tries to avoid it.