For anyone interested in the design aspects of intakes and exhausts I highly reccomend this book and the others by the same authors.
As far as the turbo / backpressure / EGT debate goes, I'll give my $.02. The turbo itself doesnt increase backpressure or EGT's that much, its the fact that your generally ramming an assload more air into an engine, advancing spark a shitload, and running at higher rpms. Those are all things that contribute to higher EGT's. Wanna see your EGT take a dive? Richen the mixture up a c-hair and increase the distance between injector and port. The excess fuel wont burn as hot, and you will lose some power. Changing the port distance will give more time for fuel and air to mix and in the process cool down the intake charge.
Really want to end the debate? Someone pony up the $2k for a decent pressure transducer. The last time I set up a full DAQ system on an engine dyno those were a little bit out of the price range. We did however measure the pressure drop and temp difference across the intercooler along with a bunch of other stuff.
For the hell of it here is the intercooler data.
The idea was to apply load to the engine for 10 seconds, give it a ten second break and repeat. Easier said than done considering the water valve on the dyno takes like 40 turns to open.