What are the pros and cons with them? Is it possible my car did not come with one? Can I attach a tab to my control arm? Weld or bolted on?
Sway bars were optional on 318 cars.
Yes they can be added. I think pretty much all aftermarket kits come with bolt on tabs if your lca doesn't have them. I had no bars at all on my 69 for almost 15 years. She'd lean in corners but it wasn't unenjoyable to drive. Kinda like driving a dirt car. I put front and rear bars on it a couple years ago and been autocrossing it. I think the front bar will make the car feel flatter for you in a corner but I think it'll plow without also having a matched rear bar. For street driving thats no problem. The only downside to a front bar is my oil filter won't come out the bottom of my car. Not sure why that's the case or if it's normal but I can get it out the top so no problem.
Can they be welded on with the lower control arm installed on the car?
I'm pretty sure you can weld those on without taking your car apart at all
ACO-K1-541-0U Sway Bar, Black, Steel, Front, 1 1/8 in. Diameter, Dodge, Plymouth, Kit (Mfr. #: 541) | 
| Ready to Ship Ground |
| $230.56 |
| 1 |
| $230.56 |
