Turboman
Mab An Gov
Check your boost presure first . Inspect boost hoses to make sure they are all sound and not leeking . dont waste money on a boost pin for the pump diaphram as you can adjust the standerd pin for free . Take the top off the diaphram housing on the pump and move it clockwise 1/8th of a turn then have a drive and see what its like . There is no point in messing with the fueling untill you know the boost presure is right
Wont make much difference anyway!
Those tyres will happily soak up a few extra horse as well!