I've been toying with getting an intake for my SI for awhile now but honestly although I could afford the $350 for a new one, I don't feel justified spending that kind of money when really besides the noise, they're pointless and even show on some dynos to make you lose a bit of HP (without a tune). So browsing all the DIY threads on here I saw a lot of good choices. But they still involved spending a decent amount of money.
I bought a whole stock intake from a friend who upgraded his on his car. Cost me $25 bucks.
I did this.
(for whatever reason I cant embed these images)
I have to fab up a bracket and shave down some parts a little more but besides that it does its job well. Above 4k and especially when in VTEC it sounds great, cant notice a difference it or any other intake only 9th gen i've heard. Also looking at the intake temps I don't notice much if at all of a temp change of the air. Granted I've only tested it for 20-30 minutes and its pretty cool out right now. I'll datalog on my 30 mile commute tomorrow and make sure.
short clip of it. not the best Mic since its from my dash cam but you get the idea.