03 GMC Sonoma SLS & 04 Chevrolet Blazer Ls
Remove test pipe. Put a new catalytic converter in and reinstalled factory tune. Drove it for a while to set monitors then had smog done ( Passed ). Came back home. Remove new catalytic and reinstall test pipe and previous tune. It gets much better gas mileage with test pipe and previous tune. Started stripping new frame hopefully by Tuesday to have it in the garage test fitting the 5.3Ls, I have no worries about smog for the next 2 years, but by then I should be long gone out of California.