Remote starter removal

how do you remove this

Take it to a shop that specializes in installing them and asking/paying them to do it for you. If you’ve never messed with installing one, you’d be better off letting someone who knows what they’re doing handle this as there’s splicing wires and such involved that you could harm the car if you’re not certain where things are located

Very carefully. These things have a zillon wires and connections. If the car is operating OK it might just be best to leave it alone.