I'll chime in here as the lone voice for top-mount intercooler and hood scoop.
If done correctly, it would be stealthy as all getout. A Subaru 2.5RS scoop would bolt right on to your stock hood, just cut two holes around the X brace in the middle.
If your car is black like mine, it'd be tough to see until it's too late.
Sure, top-mounts aren't as effective as front-mounts, but the simplicity of design and not having to worry about running piping/moving the battery/etc. might outweigh the benefits of cooler air temps. Plus, there's the money-saved factor as well. Front-mounts aren't cheap.
Relocating the top-mount to the front...now that's another story. I have all these options open to me right now. I'll decide which way to go when the ecu gets here.
i would do the fmic, drops temps faster ans lower compared to the top mount. the top mount actually allows the heat to be recycled back into the motor cause of the heat rising back into the intercooler.
actually, i have a top mount Ic right now. I had a top mount with no scoop for one summer(I know, I know). I now had the scoop for a summer, huge difference obviously. If i were to do it again, i would do front mount right off the bat.
over the winter i will be converting to fmic, money is the big object though.
Yeah on an NX a hood scoop wont hurt any way you go about mounting your intercooler. I'm putting a wrx scoop on my NA car, I'm probably gonna get some crap for doing it, but hey its a road race/autox car, the cooler the better. I plan on routing the cool air to the intake manifold the cool it down...besides NX's looks mean with wrx scoops. Whoa I got a little off topic there...sorry hahaha
With the right scoop the top mount is pretty efficent, and stealthy as all hell. I also ran my topmount almost all summer without a scoop, besides when NX-DET was nice enough to let me borrow his hood that has a scoop for the top mount. I ran the car all day at road america, 3 30min sessions a day, 2 days 80plus deg. each day. it worked well at 6psi.
The only thing to worry about with a fr. mount in a nx is cooling problems, your prob. gonna want to upgrade the radiator if your gonna get a large fr. mount, get better fans, and a nismo thermostat. Or vent the hood and make a cut of some sort between the headlights. That is if you like to beat on the car on hot days also, or if you do any roadracing or auto-x.
Never had a overheating problem for the 1 year and 1/2 or so I been turbo'd driving everyday, redline countless times a day all with my TMIC, so I say the TMIC is just fine at 8-10psi with no hood scoop...............damm I can just imagine when I make my custom hoodscoop.......its gonna be sealed directly on the IC when the hood is shut so no air escapes and it will have a water pan if u will so it'll direct any water on rainy days to the rear firewall.