well i have broken birfs when i had my 33's and an open front end . so now im locked,dual cases and run 35 SX's and still running stock birfs,but i got a feeling that its gonna happen one of these times. as for the smurfs,i have heard of them breaking,but supposedly it was a 1st one or something <img src="/forums/images/graemlins/rolleyes.gif" alt="" /> and you really don't hear anyone that has them bragging about them. but since bobby is selling direct again and taking cores,why not just spend the extra money and get something that has been tested time and time again.