Re-routing of HVAC piping and relocation of units

[Max777]

i dunno, that is a cool idea, but from tinkering around with shit, I think that the way that Mazda did it is prolly the simplest... Shure, it would look a little better, but I think that there is a ton of OTHER stuff you could do to make the engine bay look better.

some of the prime examples:

using FD coil packs and getting rid of the stockers
using FD upper manifold if you're turbo
removing emissions
using electric fan
replacing stock airbox with an AEM Dry Flo filter
getting an aluminum radiator panel
relocate the battery to the interior
Replace the nuts and bolts with new ones as you work on the car.

Well, it's not everything, but doing some of these things makes the engine bay look amazing!