ohhh ok i thought you were saying dont mod it at all. i would like to top swap, but idk... how hard is it really to do on your own? is it challenging meaning it requires thought on what you gotta do or is it just pretty straight forward but just takes time to do it all? how much is it really like 500-700 dollars? ive seen them for 1000 then ive seen them for 500 and i see m90's on craigslist as low as 300. and what exactly are ER rockers and what do they do?