i think its pretty sad that you go to put a 416 0r a 440 kit in a ex400 to beat the stockz400..no what do you think is going to happen when you put the 450 kit in the z400 ...if you got a ex400 your rite back to getting beat...

 

i think its pretty sad that u can say anything... 1st of all ur z400 wouldnt touch a 440ex with a 10ft pole 2nd of all they are real close bikes and last..trust me i race pro in texas i have seen everything and if u think a z440 will waste a 440ex ur wrong it depends on whos riding it at the time 400-440ex make up 40%of all quads at motocross races and they waste pretty much a the zs raptors and banshees in tqra the only thing that still stands in front of an ex is the 250r try and argue with me ill give u the results