wb slip on

[fasssst400ex]

i what to know how much hp a wb e-series slip on will add to a 03 kfx 400

[YFZ450Ridr]

im not sure on the numbers but my slip on gave me so much bottom end grunt. without the pipe the power comes on about midrange and with it, it pulls hard threw all the gears.

[ltz400rider118]

I had an e series slip on pipe on my 2000 400ex that I used to have. It was a good pipe and gave it alot more pull.

[MoToX199]

are they as loud as a hmf?