i would well and truly choose the gtrs over a gt30 anyday.. especialy for its direct bolt on feature were as gt30 top mount mani, gate, blah blah blah you know the usual big snail mod
the gtrs is well and truly capable of making 250rwkw on a rb20 with the supporting mods ive found the garrett equivilant and a friend of mine is tryin that soon on his rb20 so will be awesome to see