what is best head pipe for a modified 400ex on the market

 

ill tell you this,

weekend before last, i raced a stock 400ex with mine and he beat me both times....i was dissapionted.
so i took the stock header off and grinded away some of the weld inside........

this past weekend we raced again and i beat him pretty bad both times............

so the rumor is true, you can grind out the weld inside the header and it will perform just as good as the aftermarket ones....
and saves you some money

hope this helps a little........