so rather than try yet another flexi im going to try fitting a section of flexible exhaust section that is NOT stainless.i recon the stainless is cracking because of the sudden changes of temp up/down.it may not work but its worth a try.
this is what im going to try
http://www.asap-supplies.com/search/417713/mild-steel-flexible-exhaust-pipe
might not work, but i got to try something as its doing my head in! it should be here today so ill get it fitted thursday and i will keep you all informed!