Just about everyone has picked upon the good answers.

~Recirculating valve (reroute BOV to intake)
~Reroute wastegate into exhaust
~Paint I/C with black radiator paint. It wont restrict airflow as normal paint can, very little difference but its the better choice if painting it
~Stay with a thinner I/C, this means less of your bumper will be cut.
~You can run an Air to Water I/C. Issue with it is getting an electric water pump and then a reservoir for it. Then all the water adds weight (not that much but weight is weight)
~Running extra resonators will quiet the exhaust (you can make a 3" exh quiet with the right resonators and muffler)

Im sure there are others and most have ben seaid already, just breaking them down.