Looks cool slammed, I would have to bag it to get it that low... The only spring kit I found lowers less than an inch

 

^that wouldnt be worth it, from the pics of the green one stock i would say a 4 or 5 would be good but i dont think you can do that with springs can you?

 

i looked around it sounds like your going to need a custom built bag set up, there are a few guys on TR that do them.

post up a pic of yours i'll do a clean chop of a few different degrees of dumped to help give you some ideas of how low you want to go

 

Cool... here are a few.