i run a DOD FX 86 death metal pedal. oh man, this thing has distortion that will kill giants. totally awesome pedal. i think the ProCo Vintage Rat is an awesome pedal too. i used one of those about 10 years ago. really good sound. i have also used a turbo rat, and the regular rat. all good ones. i just love the death metal pedal because it has lots of distortion and has a good punchy bassy sound with plenty of cut.