Cooler air charge is more dense and will support more HP. The key is to have a properly sized IC placed so that it gets good air to and from it. In your example "So if I can run max hp timing on 10psi boost and 91oct without an intercooler, than adding an intercooler will not add any benefit.", the right IC should net you about 10-15% more power with almost no loss in boost pressure.

For the same reason, this makes no sense:

"From KenneBell;
Iced Intercooler Water – This is one variable you need not be concerned with. Cooler intercooler water does not increase HP. "

The main benefit of a W2A IC is the ability to run ice or another coolant to achieve sub-ambient charge air, increasing HP and providing further insurance against the dreaded detonation.

A prudent FI setup (especially street-driven) always designs in an intercooler unless you absolutely cannot fit one. Then meth/water injection would be the next best thing. An IC is the cake, water/meth is the frosting.



Jim