Really?I have a 2005 84bhp T5. You're riht they are too slow, I had it remapped to 130bhp fo £150 in Pontypridd S.Wales. The guy said this is he highest you can go wihout effecting reliability or putting excess stress on the engine. You can go for more bhp, but thats when problems start to occur apparently. I also get an extra 80 miles per tank because if driven sensibly it revs much lower; now it revs around 2300rmp at 70 instad of 3000. So swings and round abouts really.
I was told when getting the rempa done tghat the van should be serviced every 10-12k miles, instead of every 20k miles standard vw guide).