Review on Enhanced Star Products STATU24APB Tri-Exhaust Back Pressure Kit by Patrick Cox

But I prefer the tips in this kit. The sensor started showing vacuum. If you need accurate readings, get another sensor. The seller gave me another pressure gauge, but that was also defective. The kit includes rubber plugs that fit into several different sized holes (where there may be a check valve for the AIR system). O2 sensor plate for double nut type. or screws and threads in the plug of the O2 sensor. He also has some nuts and bolts with brass washers. Don't drill a huge hole for wrenches. Drill a small hole (13/64 I think) and tap the hole with a 1/4-20 tap. The gauge fitting screws into 1/4-20 threaded nuts. So rule out a giant hole and the possibility that the Nutsert hole is too big for the small lip on it. Then simply use the included screw and washer to plug the hole. And it can be a lot easier to find aluminum, brass, or copper 1/4-20 bolts and washers without adding nuts to the list.