I learned this lesson with car parts.24,000 miles ago I replaced the cv's on my subaru wagon.I actually replaced the whole drive train exept the engine and tranny.I looked into the diferance between dealer parts and aftermarket,found it was twice as expensive.140.00 for after market and a little over 300.00 for subaru cv's.I chose the aftermarket.I just got done replacing the aftermarket[they were shot after only 15,000]with a dealer pair!Thats 450.00 and alot of grief for what would of cost me 300.00!