Since they are probably running a bit more timing, boost, and fuel you will be making more heat. To combat that heat and to ensure the tune doesn't pull timing an intercooler is required. To answer this question, you can run any current offering of intercooler and have 100% confidence that you will see the gains advertised by Cobb using their "Stage 2" calibrationI am currently running stage 1 Cobb tune. I have been emailing Cobb about going to stage 2, they suggested a bigger FMIC. I asked about Steeda's cause theirs is 27"x8.5"x3.5" core, however they recommended I purchase theirs which is 24"x8"x3.5", however I found a fswerks one that is 22"x8"x3.5". So my main question is can I go with the fswerks and get the types of gains as I would with Cobb, or would the Steeda one be too big and lag more?