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I am going to be putting on a set of American racing catless headers on my car. I was wondering if any one has used the spacers rather than doing a tune. I have used these spacers on Many different cars and got no check engine light. They have 2 types. I posted a link with both types.
The milltek site describes it being effective with a high flow cats. Since you're going catless, I question how well it will work for your setup.
The other frsport unit pretty much had no information describing how it functions so either might be a gamble...
I was in a similar boat and ended up going with Kooks LTs + kooks green cats. No tune and no CEL, but I think the key is to also run a stock air intake/filter which I am doing. Others running the same exhaust as me with an aftermarket CAI did experience a CEL. ARH might now also offer the green cats too. Just throwing it out there as an option for you.