Yep, talked with Brian the other day. They still are doing tuning. Also he said they are doing 6.0 transmissions five speed transmissions, in addition to the old four-speed, bullet proof workhorse he built for me five years ago.
Really about all I am after is just enough power to prevent downshifting on moderate hills and grades towing.
Our Ford Severe Duty AIS alone gave additional power. I noticed it immediately after I had it installed. That was a great engine upgrade, not to mention best filtering on the planet.
I have given aftermarket exhausts a lot thought. However, sometimes me and my wife pull ten hours on the road and one wants all the quietness inside the cab he/she can get.
While they certainly will reduce EGT (exhaust gas temperatures) I have not read of any true wheel hp or torque increases.
So I do not want any drone what-so-ever. My engine already scares prairie dogs off the road. But its engine is the sound of freedom for us!