i dont know the brand ive always used magnaflow and they havent had any problems, buzzing can also be caused by bad piping or resignators which may be the issue, my magnaflows have all lasted at least 3 years without any issues, so pretty reliable. never used obx, my set up is zc with dc sports header coming down to a universal cat, no resignators back to magnaflow muffler. and 2 1/4 piping all the way back from the header. good luck with whatever u decide