a rear swaybar will help keep the inside front wheel on the ground, but it may lift the inside rear. In fact, it WILL lift the inside rear if you get the 18mm bar! I know, I had one... That means no traction out of corners with the standard diff. Let me rephrase that - no DRIVE at all out of corners until the rear wheel caomes back down!

even if it doesn't actually lift the inside rear wheel, it will unweight it resulting in less traction when cornering.

It will also increase the tendancy of the car to oversteer. I would upgrade the front bar or spring rate at the same time as you fit the rear bar. I would go for the smaller of those 2 bars.

i want it lo loose rear end traction but not the front. i just want something that will make it slide easily