my friend has a 400ex and wants to make it competitive ? what is available ? 440 ? alky ? are there any fast 400's around ? thanx

 

Ive seen some built by www.1dirracing.com that would blow your mind! Not quite as fast as some of the 450's that they build, but definitely competitive enough to where it would come down to the rider. Give them a look see, you'll be impressed.