Well I can really hear the Tubi now Had the ca running for about 2 hours and no CEL yet, knock on wood. If it does come up I might go back to cats. I know people say that there is no benefit to removing the cats, but it does feel faster and revs faster. With the Tubi in place, cats, spare and engine lid off it must have lost some weight.
There is a tiny bit of a leak on one of them, but I will retighten the nuts as soon as I get a chance.
BTW it smells no worse than my Amazons!