Anyone use dial a jet on there modded 400L? If so how do you like it and was it worth it?

 

can't help with the 400L .......... but I do have a set on my KFX , and I like them very much.

 

i use a dually kit on my scrammy,it doesn't give more hp but some more throttle response and it work great on fine jetting the carb.
it is a good product again from THUNDER PRODUCTS,i use their thundershift cam arm weights too wich is a amazing clutch tuning kit.