I recently added a K&N filter to my stock 2011 Mazda 3 GT. It is not an MS3 so it is a non-turbo. I decided to look at what a full intake system would cost me. In just doing a basic internet search, I found that most of what is out there is mainly for the MS3. Are they compatible with the non-turbo? If so, any recommendations? Also, I assume it is wise to also add aftermarket exhaust at the same time as adding an aftermarket intake but could I get away with doing one at a time? Would I need it tuned either way? Thanks.