Has anyone used these or do you mechanic types know if they work. They (the advertising blurb) say that it increases exhaust velocity, thereby increasing power, or something like that. These things are $15.99 which is a cheap modification if they do work. But I wonder if the increase in power is 1/2% or 1%, 5%?? don't suppose it could be really very much.
They come from here https://www.denniskirk.com/mid-usa/exhaust-port-torque-cones-95117.ph25054.prd/H25054.sku
Well I personally,don't know , but could not hurt to try, as long as they are not too pricey. They look to me like t hey are designed to stop reversion when piston starts to go down with valve still open.
