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This is not a cold air intake. There is no cold air source. You are pulling warm air from the engine bay. The stock intake is a cold air intake because it draws air from outside the engine bay. Any noticeable power should be from the hard pipes, and should just give a little better throttle response.
Actually behind the batery still the stock pipes and what i did was put another pipe to take air fron the bumper i`ll take a pic of that. But I agree with you is W.A.I
. The blue pipe gets really hot with the engine working. And the air filter is too close to the engine.
For me get 120 hp is pretty amaizing, I have a question for you: is there a posibility of get this 4g37 upgrades as a whole packege in USA. Here in Costa Rica is hard get only the upgrades, without buy the whole engine.
I have to say thant the car sounds good in high rpm, I have to remove my big mufler for a new noise regulation here in Costa Rica, Thats the reason i did all this, to get a little sound from the lil 1.5 engine.
here a video: