Is this a good kit ?

[orangeEX]

http://cgi.ebay.com/ebaymotors/Honda-400EX-99-04-440-11-1-Big-Bore-perf-cam-rev-kit_W0QQitemZ110011579166QQihZ001QQcategoryZ43977Q QrdZ1QQcmdZViewItem

[PismoLocal]

looks to be good I have a wiseco 440 kit and it works just fine. I don't know any thing about Magnum cams though I went with a hotcam but I highly recommend HD studs and timing chain while you have your motor apart. You should also consider getting a bigger oil tank an or aftermarket oil cooler.

I would get it...