Join Date: Dec 2010
Location: Lake of the ozarks Missouri
You will actually loose some power from straight pipes due to the loss of back pressure but not enough that you would ever feel.The only way to see it is on a dyno.
That is why 90% of the drag cars and bikes have a type of muffler on them.The ones that do not, run headers or pipes that every tube is equal length and size.
There has been dyno tests on bikes with straight pipes and just by adding a 1/4 in bolt with a 1/4 washer welded on top of it going into the pipe will give it enough back pressure to gain horsepower.