I've ran an exhaust with a decat and currently running a miltek with the cat on, I've not yet ran the same exhaust with the cat on and off so can't give an accurate comparison, but i deffinately noticed a difference running an exhaust with the cat on again, deffinately sounded like it was missing something, a lot more of a softer sound, but with it being a different exhaust it's hard to say how much down to that, can't wait to get my decat back on, on the miltek though
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