Pe,

I understand what they do but the issue, if you want to call it that, is having a set of pipes that are inside the plane. If, and it's a real big if, I was ever to attend an IMAC meet as a competitor there would be a big hit on the scale appearence due to a pair of pipes running almost the full length of the plane under the fuselage. Now to build a plane from the ground up o accomodate the pipes would be another story but a large part of the internal structure would be lost to the pipes, and isolating the heat.

There has to be another way that maintains airframe cosmetics. These things are like hanging a pair of giant Peterbuilt intake cans on the side of a Mercedes.