I just installed a Turbo XS TMIC on my 2007 WRX and I thought I would share my experience with it.
The fitment is almost physically perfect. It really could not be much better. It bolts up on top of the engine in the factory location exactly as it should. The only minor issues I experienced with the fitment were (1) one of the vertical aluminum tubes near the top right corner of it was too close for comfort, so instead of protecting it with a piece of rubber hose, I gently bent the line toward the firewall with my hand and now there's plenty of clearance everywhere, and (2) there isn't a place to attach the two black metal lines that run across the front of it, so I had to get creative with some zip ties, but it's securely out of the way.
Something else that completely doesn't matter is that I wasn't able to symmetrically line up the T-bolt clamps on the silicone coupler between the TMIC and intake manifold, but I didn't try very many different configurations, so it might be possible to do that... I was just in too much of a hurry to get the thing installed so one bolt is facing one direction and the other is facing another. Everything is properly sealed though (I'm hitting about the same boost numbers as before, according to my Prosport electric boost gauge).
I have a stock STi hood scoop air splitter and bellows and that lines up almost perfectly with it too. When the hood is closed, there is plenty of clearance between the metal splitter part and the top of the TMIC. The rubber bellows rest perfectly on the top of the TMIC too, making a nice seal around it. My only issue is that one single row of fins on the very right-most side of the TMIC are outside of the rubber, so they won't catch any air, but every other row is almost completely exposed to incoming air.
I had to unbolt the two metal parts of the stock Y pipe and reuse them with the silicone Y piece that came with the kit. I, however, was unable to reuse any of the stock gaskets because they are somewhat of a "donut" style and the connections call for a "flat" style gasket, so I made my own gaskets using a sheet of air/water gasket material I picked up from my local auto parts store for both the "Y-pipe to TMIC" seals and the "stock BPV to TMIC" seal. I put a little liquid gasket material on both sides of the gaskets I made to ensure a tight seal. Not really a big deal, but it's just a couple of extra dollars that I didn't know I would have to spend.
The silicone parts are SO much easier to connect to the turbo and the intake manifold, it's just silly. The stock plastic Y pipe was always a pain to get on the turbo, but I won't have to worry about that any more. I'll just have to be careful not to rip the silicone, but that shouldn't be an issue.
The Turbo XS TMIC is significantly heavier than the stock WRX TMIC. Not really a big deal either, but just something to be aware of. I was sort of surprised. It makes sense though - it's physically larger and doesn't have any plastic on it - it's all metal.
So far, it's also compatible with my Cobb Stage 2, 93 Octane off-the-shelf map. I've taken it to WOT several times now and the car hasn't thrown any CELs, but I'm still planning on getting a protune for that and some other goodies at IAG as soon as I can get scheduled.
I couldn't figure out what the plastic T fitting or the clear tube that came with the kit were for. The kit description said they were included if you needed to modify anything, but I didn't need them for anything.
I was worried about being able to reach the transmission fluid dip stick underneath it, but that won't be an issue. I can still reach the dip stick without having to remove the TMIC and I'll use the same funnel with a long, flexible hose that I used before to add fluid... no problem.
Overall, it's an excellent product for a reasonable price and I'd recommend it to anyone