Deceleration valve leaking?

AJ/FormS said

Looks like a CAT protection device to me, to promote end-gas burning in the manifold, prior to entering the CAT.
No CAT/ no problem,defeat it.

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Oof, i still got a CAT and have to have it hooked up per CA smog stranglegold. I suppose I could defeat it somehow, plug the inlet...will investigate further tonight. Should be able to just plug the air cleaner feed and then it can leak all it wants as it wont have any fresh air supply. Vacuum sense line is easily pinched off.