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anyone have experience with bars leaks- valve stem repair. I am getting smoke at starts up and believe it is the valve stems. Nothing bad yet but I'm looking in to replaces the head with one from rock auto. anyways anyone had luck with this stuff. i wanna try something as i have to drive 400+...

so the front cat on my p5 is hollowed out. I need to pass smog. a new cat is 260+ is there anything i could do to get it to pass with just the back cat?