MrUnlimited

Ok, I think it will not add anything to the overall performance. In boatracing we use a copper or alloy coil around the header to cool down the exhaustgas. Difference is we have fresh cold water from the lake through the waterlines to the coil and the watercooled head all the time picked by the waterinlet in the rudder.
The two devices from Fioroni and NovaRossi are ineffective while it is only aircooled and the exhaustgas is tranfered at high speed to the fueltank for pressure.

casevac

That's probably the one...
Adding a large fuel filter or a designated exhaust-cooler device on the preassure line will give some of that effect on the fuel tank preassure as well, maybe?