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G'day Booshie,
a generalism I've found holds up pretty well is, if all is good before you fiddle and all is crap after, the fiddle may well have something to do with the new status.
Cat converters are there I think to reduce crap emissions. How they do it is a mystery but I reckon you should wait for the new system before getting to excited.
Coupla reds, settle down and wait and see,
all the best,
Col
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