Please help!

I recently have brought a 2013 wrx. The car already had a tomei exhaust with a invidia catted down pipe, it also has a tune from maximum motorsports. However i am looking for a little bit more oomf while keeping it somewhat sensible. Every post i read says different thing and i am wondering where next step is?

I wanted to get a mishimoto CAI because i love the sound ( i understand they dont add much if any power to the car), but a lot of posts have said that the CAI is a waste under 350hp. Is it still safe to run the CAI? With a tune after install of course. I would be very happy if i could get the car too 250-300 hp. What are my next steps?

Thanks