Long story short, sold my cdi box and gonna use that plus some extra to get a new cdi box/rev box for my 2000 300ex. Theyre all around the same price it seems I was just wondering which brand is the best bang for the buck. AMR racing has a stage 3 one for 90 on ebay (as compared to 120 at their online store) that im leaning towards but i dont have experience or knowledge with that brand. Anyone got any info or tips? I just had the opportunity to upgrade cheap and thought id take advantage of it.