Posi-ProductsT Car Stereo Connectors
These things are awesome and easier than crimping. I still think saughtering and heat shrink still gives a better connection, but this is quicker and if you for some reason have to reverse the operation, it is very easy to undo these connectors and they can even be reused. No need to recut and restrip the wire again. Gives a solid connection.
Pros: Please use a vehicle specific wiring harness adaptor, DO NOT cut your factory wiring and hardwire it in.