i need help??? on the drivers side of my 89 pathy 4x4 there is two items im not sure about....basically the little barrel that has a freespinning little plate and the big black cylinder with a few hoses going in/out it all just behind the drivers head light if anyone can tell me if these two things are 100%necessary for the running of the motor.....and also can someone give me a list of things that can be removed to add power and clean up engine bay?