Hey guys just want to chime in here I have a 21 st with the lms stage 4 tune, whipple ic, jlt catch can, and an mrbp cat back. Car came with the 1/3 subframe, in December it failed. Dealer had the car the entire month of December due to back order on parts but they did replace it with the 2/4 subframe under warranty stating it was a mis manufacture.