it exactly is called an anti reversionary cone,the idea like branson says is to keep gasses going back down the cylinder in the milli seconds its opened and to keep the gasses from going the path of least resistence back toward the head in stead of toward the exhaust out the back .Keeps the engine from having to push that gas down the tube the next exhaust cycle.It has provin on the dyno many times to be worth some power across the band width.
Im so far behind ,that I think Im in first.
Im so far behind ,that I think Im in first.
