Originally I just used some 2" spa hose and pvc elbows, which is very easy to work with. Just cut to length, glue together and paint it red. Then (cause bigger is always better) I found out they sell universal intake/intercooler kits on Amazon. For 100 bucks you can buy a kit of aluminum tubing whatever diameter you want, with prebent 90's and 45's and whatever color you want. So I went with 3" aluminum tubing, some silicone reducers (3" to 2.5" to go on throttle bodies), and KandN RG-1001RD universal filters. Problem I had is how big the radiuses are on the tubing. Made it very hard to fit. Ended up using silicone elbows on middle one, that's why it is black. There is an endless amount of silicone elbows, reducers, couplers, different colors, but the silicone isn't really strong enough to hold up the filters by itself. Those filters are quite heavy, heavier than the first ones I had on there. Here's some pics.