As long as the car is put together right and isn't way out of whack in the tuning, simply throwing main cats back on and getting the car nice and hot before going in is all you need. It's been done on everything from Stage Vish stock turbo cars all the way up to the local 600hp cars with no problems. Don't think I've ever heard of anyone failing a visual for DPs in Cali though I know elsewhere they are pretty strict.
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