A 3in hybrid I made for a customer.. and the crazy thing is all the power it made on a tune for a stock intake.. so he still needs a re tune.. the afr's are now in the 11's when it was tuned to lean 12's..
this was on a 2006 impreza 2.5i 5spd.
http://forums.nasioc.com/forums/show....php?t=1471819
on the first page you can see the hybrid intake. I will get pictures of the one I made. I used a s2k aem intake.. had plenty of pipe left over. So possibly you can find a good deal online for one used and re-create.