Heat soak is a real problem with Viper engines. The more temperature sensed by the IAT sensor the more timing the cpm pulls, and performance suffers until the sensor allows the pcm to add back the pulled timing. This is a safety program that inhibits detonation. But as in many instances the planning parameters are way conservative. As heat builds in the engine your performance will decline. So everything you do to reduce heat helps keep the performance at its best.
The 170 thermostat helps some...putting a 5.6 ohm resistor in the IAT circuit also fools the pcm into leaving timing alone a little longer, but cool air is the real ticket! For all of these reasons most forced induction engines use a cooling mechanism.