Was thinking about buying injen piping... Suggestions?

 

Lower pipe is the one to change, but if you want a full set, I recommend NISEI, which is what I have, they have a short route upper pipe ( gains in velocity) and the best lower pipe ( has bracket, and it's aluminum) I personally love the NISEI construction, fitment and looks ( mine are red) you do need a mini battery though, or relocate to the trunk ( which I did )
Injen doesn't have many good reviews for the evo.