if i got a skunk2 intake manifold for my gsr and matched it with a similar tb say like 68 mm - 70mm.What would be the ideal intake for that setup? Would a type R CAI work better since it is bigger diameter?Or is it same as a gsr?

p.s isnt the comptech icebox and intake just like the stock intake system but with a cone filter?Is it really worth all that or could i just open my stock intake up run a little pipe from it into my stock airbox then connect a cone filter and it be just as good?