He's not a fan of the deep pans because they are just that, too deep. Yeah, you get more airflow across them to help cool, but it actually has a negative affect on the fluid inside. See the filter/pickup tube gets the fluid off the bottom of the stock pan. But when you install a deep pan, you're sucking fluid from the upper part of the fluid, not the bottom. Brian's thought is that you're not getting proper fluid flow resulting in greater inefficiencies by having a deep pan and stock filter/pickup.Don't ask me why but when I talked to Brian at BTS he asked me if I kept the stock pan on my tranny from him and he for some reason he wasn't a big fan of an aftermarket pan. Just an fyi so you may want to do some more research on that topic.