Why a FMIC? Well, there was a decent article in Import Tuner a while back that explains it rather simply and effectively. Turbo car owners and especially MK4 Supra owners can turn up the boost rather easily in our cars. The stock intercooler does a decent job with even moderate boost increases. There are some trade offs and possible down sides with increasing the boost in any car. What sacrifices are made when turning up the boost? First, when boost pressure is raised the compressor (turbo) output charge temperature (temp. coming out of turbo) increases, this is a fact. These higher charge temperatures can lead to detonation and in a worst case scenario serious engine damage. Intercooling decreases the chance of detonation by lowering the air intake temperature. With a smaller chance of detonation, engine reliability is improved. From a power production stand point, the higher the charge air temperatures associated with higher boost levels have an adverse effect on air density. As a rule of thumb, every 11- degree (F) drop in charge temperature results in an air density increase that allows for a one-percent increase in gross power output. Likewise, an 11-degree (F) increase in charge temperature can reduce power output by about one percent. Thus, the importance of intercooling for maximizing reliability and power is obvious. If you run your car hard, especially on higher speed runs and live in a warmer climate I would recommend a FMIC. If you have a single turbo or race your vehicle in road racing or auto-x, once again this is a good choice.

So, in a nutshell a front mount intercooler cooler upgrade will NOT make HP in your Supra, but it will free-up power that has been lost from inefficient intercoolers and most importantly it will maintain power for a longer period of time and reduce the chance of deadly detonation.