Yes they have smaller losses but the kit doesn't fit as nice/look a snice in our eyes that why we use the Harrop kit, regards R&D can you enlighten me please what Cosworth have done over and above what Harrop had done please? I presume you referring to the engine work they did in regards engine loading.
, exactly them same as Harrop did when they developed the kit , they have had a GT86 Development car for a long time.