Drop in filters from k&n paired with some MAF tubes from Z1 have been noted to get more gains than short ram intake but a little less than cold air intakes like stillen and takeda. Not to mention drop in filters and MAF tubes are cheaper than both of the other options. As far as F.I. Exhaust that is a very good choice bud. F. I. Is excellent quality and is worth the wait. I would've gotten it if it wouldn't have taken so long for me to get it (3 months) so I went w/ ark dts. But then again it's all your choice