Thanks Guys ,

These are the sort of answers and questions in was hoping for !
Wes , the biggest turbo i can use is a T35 before i have homologation problems ,although this year ,for the first time im allowed to use a non std fit intercooler ( as long as its sourced from the range ! i.e The 500 one !). So ,if i can use a 500 intercooler and the eligibility scrutineer lets me get away with a 500 plenum only running 4 injectors , its a no brainer really ,the extra bore TB &elbow is free perfotmance .so i'll use that .

Simon ,
As i already have a P8 that runs greys To 400hp ,i'll probably stick to that for a while ,the turbo i have may not show the benefit of bigger injectors !
thanks