White Bros R4

[hd400ex00]

why did they stop making the white brothers R4 slip on for the 400ex

No one will be able to give you the correct answer unless they work there. My guess too noisey? Maybe not selling very many? Who knows? Its a great pipe though!

[yellowWB400ex]

I love mine only difference is its the promeg full system. I think they stopped is cause of the noise regilations at tracks and races but still good pipe:D