Which Exhaust Brake for HO w/48RE tranny

[Singletrack]

I am shopping for an exhaust brake and tranny lock-up controller for my '03 HO w/ 48RE automatic. I am concerned about some claims that it may void the warranty.

I've read various comments on TDR about using exhaust brakes with the new 48RE automatic. Some Dodge Cummins owners have success with dealer installations of exhaust brakes and some owners are rejected.

However, the most concerning comments come from Carlton Bale -
Cummins Exhaust Brake Development / Engineering.

I have two questions. 1) Does the installation of an exhaust brake and transmission lock void my warranty?
Banks, BD, and Pack Brake reps tell me that it doesn't. A Jake Brake rep explained that they don't have a solution yet for the 48RE but they are working on it. I would like to hear what you, the end users, have learned.
2) Which brake /tranny lock provides the best value and preformance? Is it the Banks exhaust brake with Smartlock Tranny Brake, BD exhaust brake with BD TowLoc or AutoLoc or Torqloc, The Pac Brake with ATS lockup controller, or Jacobs exhaust brake? One BD rep told me that the 48RE does not require a tranny lock because it provides positive lockup down to 1,800 rpm.

Any comments appreciated.

Tom

'03 Quad, 3500 SLT Laramie, Sport Pkg, DRW, 4x4, HO/48RE, 3.73 w/Limited Slip, B&W Gooseneck hitch/tow Pkg.