Had the full width Allisport intercooler fitted almost exactly 3 years ago. Major difference. Don't have to change gear as much, can pull up hills with less/no loss of speed. Turbo kicks in at just under 1500rpm, so acceleration is better too. Wouldn't be without it.
They did not make any changes to the pump either, so all improvements down to intercooler and removal of EGR.
Just had a raised air intake fitted last week. Have to say, I have noticed a slight dip in performance since so I will be checking that over soon.
Si