I have the 3.5 in lift and love it. Only thing I would recomend is an adjustable track bar. I dont know if one comes with the 4.5 in lift but with the 3.5 I got a relocation bracket, and its definately a piece, as all relocation brackets are. All around great system. I would definately recomend it to anyone, so go for it, get the kit, and enjoy