Anyone ever heard of or used this stuff??? Is it even worth trying? http://www.crcindustries.com/crcwebcanada/Portals/0/canada/automotiveimages/75060b.jpg Finally got my car to be able to be tested using the tailpipe test, but it didn't pass the low speed testing. The NOX or is it NOx was high. High speed it passed fine. Was wondering if anyone here has actually tried this or can recommend something like this that actually does help.