Pressure Drop, for example. I had my wastegate set at 10 psi before installing the I/C and after the psi was measured at 7 psi, so a 3 psi drop. If you look, I am running a 180 bend and two 90's, so I would worry too much about pressure drop. I just adjusted the MBC back up to 10 psi. Bam!!
In terms of power, the best way I can describe it is.... before the I/C, when I first go the truck to operating temp and power was awesome/strong/lineal/lag-less, then when the engine bay would heat soak and the power level would drop because of it blowing hot air. Then..... I installed the I/C, the power level always stays like it is when you first get it up to temp., just all the time, which is Awesome!
For $300 bucks, it is totally worth it.