NoterminatorI love BMR they def have the quality and stand by their products. Don't really know much about J&M though.
ANGIE 06Ford Racing SVT lower control arms have stiffer rubber bushings, I have these on mine. The BMR arms may use the poly bushing that give more vibration. Punch in 2012 mustang lower control arms on Ebay. What are you trying to accomplish?, do you have wheel hop problems?
onlycoderedI do have some pretty bad wheel hop. I've looked at the Ford Racing ones but they look like slightly better stock ones. I'd really like to get LCAs with poly bushings. Vibration is not a problem for me. My previous car had stiff poly motor mounts so I'm no stranger to NVH! Hahaha