I originally bought the PHR solid engine mounts but switched to the TRD. I have a buddy with a T78 that drag races and he is still using the stock mounts. He also said that when he switched to the solid mounts everything vibrated...way to loud. Also I was told that the solid mounts are really for race only purposes and not for daily driving. When I get ALL my parts from PHR and MVP I'll let you know immediately about the TRD mounts.