Luis BRW,
Jackson Racing is claiming a reduction in temperature of 100 degrees.
http://www.jacksonracing.com/Shop/ViewProducts.aspx?PlateIndexID=33358 I'm a little sceptical of that but it may be so. . .
If it is then it has the edge in the cooling department, however if your timing and boost are all set up to operate with H2o/methanol Injection and then your pump, solinoid or water tank fails your in deep s...t !
The intercooler is the reliable method in my opinion.
If some one builds a controller that would retard your timing and reduce your boost in the event of any component failure then that would significantly improve the safety factor.
I have a large Intercooler that I'm setting up to run with a Vortec "S" trim blower on my 250. This thread has really peaked my interest in the H20 injection though !
I have also seen where the guys with the Turbo drag cars spray Nitrous on their intercoolers to chill them.
'Crockett