I JUST RECIEVED A COIL SPRING CONVERSION KIT AND WAS AMAZED HOW SIMPLE IT WAS TO INSTALL. I PAID $300 TO HAVE 1 BAG REPLACED 6 MONTHS AGO BY A MECHANIC AND I REPLACED THE ENTIRE SYSTEM IN 2 HOURS AND NEVER NEED TO WORRY ABOUT BAGS, SOLENOIDS, COMPRESSORS OR DRYERS AGAIN. GREAT PRODUCTS! THANKS YOU!