I dont know if this is suspension related or tranny related, but here it goes....

I own a 94' WRX. This past summer, I got rid of the stock wheels and replaced them with a set of 17" Enkei's. I drove on them for about 4 months before I had to switch back to the stock wheels on winter tires. While I was swapping wheels and tires, I noticed an excessive amount of grease all over the new rims I was removing. Upon further inspection, the front left CV boot was shredded all to hell, and so was the front right. I dont know what would make both go at the same time. Anyways, they like to gouge americans on car part prices here in Japan.... I got quoted $100 per boot.... I am only assuming this would include labor, but I am more of a do-it-yourself kind of guy. If anybody has info on what would cause this, and, even better, how to fix it (where to get good parts online too), please let me know! Thanks!

 

I am assuming $100 will only get me the boot and over the labor to put in. Is it necessary to replace the entire half-shaft? I know over time, things can get pretty messed up in there if the boot is torn and the joints exposed. Steering and suspension arent really my fields of knowledge because I have never ran into any problem with those systems before. HELP!!