How much does grinding the weld on the 400's header help it out?????

[frogburner]

The weld on the inside of the header of the 400, is there a noticeable difference after grinding that weld off??????

[Kadafiy]

I don't know how much of a difference you will see from this mod, but it is worth doing. If you have your bike apart or are adding a pipe then do it. I did mine and it was simple. I did mine the same time I added a slip-on pipe so I have no idea how much it helped.

[Tlongs400]

i could tell a difference,it weren't 2 bike lengths or anything like that,but it is worth doing

[max400EX]

It's nothing huge, but all the little things add up.

[ChadEXer]

It just might put you ahead that extra inch to win at the last second:D