I just upgraded to a 1991 Eclipse GSX from a same-year GS, and naturally I've been doing a lot of studying up on turbo theory and upgrades. A great deal of emphasis is placed on the fidelity of pressure and temperature of the air in the turbo system. What I don't understand is, why don't people get some sort of gauge that can monitor the temperature (not just the boost) of the air running through the system? Is the air just going by too fast to get an accurate measurement? The reason I bring this up is that it seems like a lot of people are upgrading intercoolers and pipes, etc (and spending a lot of money in the process), without really having a quantitative sense of how much of an improvement it's making on their cars. Just a thought. Anyone care to enlighten me?