Just read this froma link posted on here a bit ago wanted to know peoples thoughts as i was thinking of FMIC with my TT conversion
The fallacy of the FMIC
In the process of fitting a 'badass' FMIC the SMIC is ripped out and thrown in the bin. Then comes the painful hacking of standard parts, in order to make it fit.
The only place for a FMIC is at the front obviously, right before the aircon rad (condenser). This inevitably leads to the elimination of the upper ducting, sometimes even the lower one. The airflow through the coolant radiator has been compromised, and that is without yet taking into consideration the huge, thick core stuck in front, preheating the air and reducting the pressure difference across the core. Autos have a trasmission rad inside the coolant rad, so that is affected as well.
It gets worse. The new FMIC core now has no proper ducting, and the air can (and does) flow easily around it at higher speeds. The airpressure behind the FMIC core is not much lower than that at the front (remember the cardboard experiment? the two other rads act as the cardboard here). So the airflow through the FMIC core is not several times larger than that of a SMIC, appearances can be deceiving.
Worse still, the FMIC core sits yet closer to the bumper nosecone, without the benefit of an expansion chamber. At higher speeds it is easier for the air molecules to 'overflow' and spill outside the bumper, creating more drag and depriving the engine bay from much needed cool air.
As an extra bonus a few FMICs require the elimination (or crippling) of the active spoiler.
The coolant expansion tank has to be relocated usually, swapped for a smaller one tucked away next to the battery perhaps. Power steering pipes may have to be readjusted as well.
The FMIC can also be seen as an engine bay preheater, because that is the other side of coin. Not only does it restrict the airflow for everything else, it also preheats what is left of it.
What about parts that depend on direct airflow for cooling, like the alternator? How long is that going to live in this hotter environment?