difference between MBC's

I think im in the correct subforum and ive looked all over the internet and cant find this info.

all the mbc's u guys have reccomended are like 70 which isnt that bad but they have some that are like 16. Why pay 70? Is there a difference in quality or something?

For christ's sake dude, do you need two threads on every topic you've made? Read this (http://www.automotiveforums.com/vbulletin/showthread.php?t=633951) and get square on how this forum is run, this is getting re-fuckin-diculous.