You have filters without the regulator that look the same. That is why you have to either do the work yourself, or at least supply your own parts, or take it to a known mechanic familiar with the car. These ******* children are a pain in the ***. I am in the middle of trying find info for wiring up up this damn zeitronics and its sucks with little direction. She's going to a shop before I screw something up. Corvette is starting to sound good again.