yes, you can make a diy intake. theres a thread or 2 around here for the 1.8. you could also just get the maf adapter and throw a nice filter on it, but its better to at least tuck the filter behind the battery, so youll only need 2 small bent pipes and some couplers.
I have a cold air intake i bought from ebay labeled OBX DIY. I haven't had the time to do the actual install but you will need to get a flat bar in order to mount the lower pipe other wise it is just hanging. I would stay away from it in terms of bolt on and drive; unless your a DIY you can make your own flatbar mount and your good to go. Mind you the upper pipe is 2.5" and the lower pipe is 3". The grommet seems small that came with the DIY pipes but everything will be revealed once i get to installing. You can follow my thread as i will be posting pictures during and after the install.
after your 2.5" pipe with the fittings, should be the maf, where you can use the maf adapter, water filter if any, and pop the filter on. thats short, so unless you want to cut out your hood and make it short-ram. you should have another piece to bolt on to make it cold air as extra piece, the 3" pipe, if you really wanted, you could make the filter tuck behind the battery by cutting that 3" pipe shorter.