The Mishi J-Line takes some work to fit but it is a big IC and great for hard core use, mine did a superb job going all out lap after lap at MMP, 130 MPH in a 3rd,4th, 5th gear pull at least 80 times in two days and the temps were great, I have to go look it up again.
BUT, my track weight is very low and a bit to low in the rear so I had to keep the tank nearly full when hitting the brakes at 130 at the last moment possible. I need to lose more weight on the front of the car so likely selling my J-Line and downsizing a bit to the Cobb.
Since installing a bigger radiator next, have an oil cooler, fully opened up grill and bumper, heat sheilded piping where needed. I think I will be fine with the Cobb, hope so.
I am also most likely getting a CF hood though want it painted.
I am setting up the car for TT events and the class I most likely will be in requires I do all I can to be competitive, I do not want to take out any of my fun mods for a lower class even if I am better off there, not as much fun going a bit slower
So, the J-Line is great, takes more work, costs much less and weighs more but it will handle as much power as you will probably ever make out of this engine unless go nuts on a giant turbo, built engine, etc........and then probably still plenty of IC. Or, live in the south, humid weather....then this might be the best even on a tuned stock turbo or cyborg turbo.