those are pretty much all the pipes and headers i carry xept the grp 2053. alls i gotta say is that mod grp 28 should be awsome. whenever i run around 28s i start trying to keep up with 21s lol(kind of like golf and others hitting longer than me). modded wow, that should rock, and get better fuel economy than non mod. way too much power for me...straight out of box they are smooth though...