Ok, we bought an 98 legacy gt limited 2.5 about 6 months ago, replaced both head gaskets, oil seperator plate, numerous sensors, gaskets, and all belts. now we have a coolant leak and we're getting code p0420. Ran seafoam thru a tank of gas but it really made no difference in performance or mileage. This car runs and drives great but it's nickel and diming us to death. Sorry for the rambling but this forum got us thru the tear down and rebuild and I find the info from the experts invaluable!