I want to get a CAI for my B18B and was wondering if anyone has access to dyno graphs in which we can compare different CAI systems on the B18B not the b18c1 or b16a's. If anyone can help out I would really appreciate it.

 

For the most part Injen, K&N, AEM, all those guys and the like are the same. The only difference usually is the filter. A lot of tests vary, one its going to depend on the widt hof the intake tubing and how smooth it is inside. But generally the stock airbox is designed for the most efficient airflow, thats why its there. You can dro pa K&N in it or modify it a bit and still have teh same effect for the most part.