Welcome to the club!
Well, you don't need tuning just to get the converter to work, but I would always recommend tuning to any car that has been modded at all. You should see a nice improvement with both a converter and a tune.
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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