Quote:
Originally Posted by SirBrass
You can't flash back to stock if you're running a catless header (the unnecessary O2 nannie will throw a CEL), and if you're running FI, then you've got the major issue of having a dangerous tune running while boosted.
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You can flash back to stock while catless. It doesn't throw a CEL instantly. If you flash it in the parking lot, then go for inspection, you will pass. If you drive 20-30 miles, then you'll probably see it.
Flashing back to stock while FI isn't an option. At that point, you pay someone under the table to get you inspected if you're catless and don't want to risk running a bad tune.