There are two basic kinds of exhaust brakes for a 7.3L PSD. The good kind adds a big butterfly to the exhaust pipe, and costs over $1,000 from Banks, U.S.Gear, PacBrake, BD Performance, and some others.
The "electronic" kind are much less expensive. You can do a simple switch for a few bucks that will close the stock exhaust back pressure valve (EBPV). The closed EBPV acts as the exhaust brake, and works pretty good on stick shifters, and on automagic trannies when the torque converter is locked at over 2,000 RPM with the trailer pushing you down the mountain. You can even add the switch with DIY procedures:
TheDieselStop.Com - DIY Exhaust Brake.
The fancy electronic models for trucks with automagic tranny cost abour $400 and include a small computer chip that keeps the torque converter locked as well as closes the exhaust back pressure valve (EBPV). And it automagically unlocks the torque converter when your speed drops to whatever you program it for - about 30 MPH works good for coming to a stop. If you have a manual torque converter lockup switch and you forget to unlock it when coming to a stop, your truck will fuss at you the way a stick shifter will if you forget to mash the clutch pedal when coming to a stop.
With a stock tune, the computer will unlock the torque converter when your speed falls to below about 37 MPH. And it will lock the torque converter when your speed exceeds about 37 MPH. With my SP Diesel torque converter controller, I can easily change those lock/unlock speeds to whatever I want. I like mine to lock at about 35 MPH but to unlock at about 30 MPH.
Mine is the Speed Sense Exhaust Brake and Torque Converter Controller (SSEBTC) from
SP Diesel
BD also sells one for the 7.3L called the BrakeLoc
BD Power - The Leaders in Diesel Performance
BD sells both the BrakeLoc and the much-higher-priced BD exhaust brake, so they will try very hard to get you to skip the BrakeLoc and spend the money for their good one.
If that e-bay thing controls both the EBPV and the torque converter, then it might be worth the money. If not, then either DIY or invest in the $400 fancy electronic good ones from SP-Diesel or BD.
