--Hi...Thanks for all the help on my '86 4kQ. Next questions... 1-What tire pressures do you run for general, all-weather, light load highway/suburban/city driving? 2-Do you change pressures for high speed long distance driving, or for snow or rain? 3-Any suggestions about the exhaust system...mufflers, 2.5 or 2.25 cat-back systems, etc.? Thanks again, Sabutin