I have a 1989 Ford F250 with a fuel injected 460ci. I have a new cat back system bolted and flanged together do I need to have it welded to pass smog?

So long as the CAT you used was California certified (50-State Emission Legal) you can pass the smog check with it bolted and flanged on. Having the Catalytic Convertor welded on is not a requirement unless there is a noticable leak where it was installed. As standard practice, smog stations like to see an old CAT which was cut off and replaced with a new one, welded on. And CAT removed simply by lossening bolts, bolted back on.

posted by SmogTips Support