no u cant

So I can turn them on?

Stylized Lines is merely a visual cheat

Do visual cheats like stylized lines need to be turned off too or is it just any cheat that affects gameplay?

noice

lost to echos is a nightmare for me so i don't think ill be getting that car anytime soon :/

Found a better if trickier way of the Violent Heart part: Turn the car around so you're facing the wrong way. Drive off the edge, and roll over. Use your Stickdown thrusters (LB using the 360 controller) to slow your descent. The car will float in the direction your bottom is facing, ex if its tilting to the right, you will go right. If its tilting forwards, you go forwards.

Once you're airborne, avoid the mines and corruption spikes, and head to the right side. Done correctly you'll see a clear strip near the death zone past the spikes all the way up to the Nitroni Crush machine, and a pinkish strip on the wall going up. Go up this strip until just before you make it to the curve, then jump off. Roll so the top of your car faces the wall, pulse your stickdown thrusters, and then let the car fall. Done correctly you'll drop right on top of the platform holding the machine. From there, enter the machine and grab the part.

Yes, this car can be used in multiplayer.

Can you use it in multiplayer?

<3333333