Would someone be so kind as to explain the average cost of this upgrade along with the gians it achieves.
Cost depends on where you buy the core, pipes and bolts from and who fits it.
You should get the assembly for about £300 including pipes. If doing it yourself, thats all it costs, If you get someone to do it for you, be sure they have done one before as the first one takes about 5 hours, but it takes about 2 hours per each one after that.
Gains are going to be achieved courtesy of the approx 20% drop in inlet temperatures and this would mean that running higher boost would be better managed
Cars with uprated intercoolers seem to perform better on the rolling roads vs similar cars with no uprated intercooler.