Hi. I am in the midst of making some engine mods such as 800 heads, altered 900 cams, new larger valves necked and swirled, porting and polishing. Probably not a lot new to any one but I have found the engines at full noise seem to have a lot of reversion with big cams. I am wanting to know if anybody has tried using anti-reversion headers???? I will be making them myself and was keen to hear from anyone who had tried them. What size was used, weather it was dynode and the end result. Any help is appreciated.