This past weekend I had the cat cut out of my exhaust and replaced with a test pipe. I also had a 90 bend welded on the test pipe. I am obviously getting a CEL (will have o2 bung shortly), but I am more worried about the idle. It is fluctuating a few hundred RPM's but hasn't stalled out. Attached is a picture of the decat. I have a feeling I need a tune to correct the idle, but thought i'd ask. Thanks in advance.
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