When I was ready to put my engine in the 2.5" inlet pipes were not available so I made some along with the rest of the intake.
This was when I was running a FMIC . 2.5" inlet pipes with 2.5" to 3" , 45* coupler to 3" aluminum intake ( accordian ) pipes straight to each maf located where the smic use to be 2.5" aluminum inlets 
2.5" TO 3" Coupler to 3" aluminum intake. 
you'll have to open up the factory holes under the lights to get the 3" through .
3" with recirc ports welded on. These slid through the factory ( enlarged ) holes from the front and joined the 3" intake pipes on the inside of the factory holes. 
new recirc port location 
everything out (except the 2.5" inlets) and replaced with 2.5" pipes , Ash planner set up and Ash Massives
I bought 2 kits of aluminum piping from cxracing ( good wall thickness ) . One kit was 2.5 " and one was 3" . Each kit came with (6) pieces, each piece was 24" long . 2 were straight , 2 had 45* bends and 2 had 90* bends . Each kit came with couplers and clamps , $66 per kit iirc . Not sure if that helps but 3" will work .
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