after fitting I realised they were Venom pipes(not Viper...doh!

)
bike seems to run fine,no spluttering or flat spots up to 120 mph(bit too slippery to go quicker at the moment

)
sounds bloody lovely too and I contacted Venom the other day,they do sell hi level and low level link pipes seperately.these pipes just make the bike look better and definately save a few kilo's in wieght too!!