Any help appreciated looking to buy adaptor that will allow wiring to be compatible my wrx has one big multi plug but the new man ifold seems to have 2 plugs on its wiring does anyone know how to get round this cheers Alan

 

in a word No, there are different sensors on the sti so there would be more pins on a STi loom then you can match up to on a wrx, so you need the loom.