Turn it over and drill a few holes in through the parts you can get too.Any of you guys with dynos ever fool with gutting, adding holes to a stock muffler and comparing to a header on dyno? I'm wondering what hp might be left on the table on a 12-14 h.p. or so build [mini bike].
Thanks
Yes our track just started the Box Stock class. There is one in particular I am going to watch. It sounds much stronger than the rest of us on the grid. With that screen on there doesn't seem like it would so much good to drill holes. Seems like that screen would stock anything.