I'm going top mount short route piping on my car because i plan on ripping the front bumper off and running into shit....alot.
I could care less what the performance gains are as long as my bits and pieces are out of harms way.
In terms of overall cooling, air doesn't have to pass through the intercooler to get to the radiator. Much more surface area is exposed to cool air and the vent allows air to pass through the front bumper through the intercooler and through the reverse vents in the hood. For my setup i'm building i want my oil, air and water coolers to get as much fresh cool air as they can and have as much hot air exit the engine bay as fast as possible.
I'll accomplish this with a setup similar to this:
That's the vent i'll be purchasing in a few days.
Here is a subie running a similar setup. I consider it a v mount radiator with a high mount intercooler. Fins are parallel with the ground.......
I'm told throttle/turbo response is quicker with shorter piping but doing the setup strictly for that purpose is debatable.
+1 for subie owners playing with mommy and daddy's money. Atleast all the evo/subie ass clowns around here do. Faggots like to throttle up and let off next to me like i'm jealous of their bov's and turbo spool they didn't work a day to get and will probably total within a year thinking they're fucking ken block.