so after a lot of reading and research i decided to try the mad max diverter. Bought a evo 9 diverter for £60 ebay. Turned up, did the fill on the oem hole and drilled the new one. Fitted and went for a spin. i did not crush the top part yet, im not running huge boost and fitted backwards( reversal of normal dv fitting) First thoughts are very impressive. Very responsive and good pick up between changes. off to work now so i will let you know how it works on a longer run.