I think that you saw Erin Wolf's ex racer from www.400ex.com Look through his mods.
C&D Racing, 308-696-7805
SOLD ---------- SOLD
2001 400ex, JE 416 10.8:1, Hotcams Stage 2 Cam, C&D Racing Port and Polish, Viton Valve seals, 39mm FCR Carb, Complete Curtis Sparks X-6 Exhuast, Sparks Timing Key, Magnum Rev Limiter, Sparks 8 Plate Clutch, Race Cut Fenders with CarbonFiber Hood with Scoop w/ mesh insert, Magura Hydrolic Clutch, Steel braided clutch line, Holeshots MX Rear on Red Labels, Holeshot MX Front on Red Labels, K&N Air Filter with Prefilter, ShockWears, AC Skid Plate, and Polished Propeg Nerfs, TAG X-5 Bars, Kill Switch, DR Blockoff Plate, OMF Radiator Shrouds, Elka Triple Rate SSD, Rear Elka Rebuild, +2 Houser a-arms (HammerTone and Chrome), Lonestar Axcaliber 2 + 2 axle, Polished Motor Mounts and Sidecase, DR number plates, PEP Steering Stabilizer.
C&D Racing, 308-696-7805