
I'm not 100% up on the 3G 4WS but at least on 4G/5G changing your suspension doesn't require anything special for 4WS, you just have to make sure the rear wheels can still turn and don't foul on anything

IMO if you're slamming it then you're going to run into issues with 4WS at some stage, and from what I've read 3G 4WS is amazing so you would be making quite a sacrifice if you were to bin it.