If it's a diesel with EGR then it has a potato brake of some sort already.
Turbo's with a VGT close off the vanes creating back pressure, which is needed to drive the EGR.
Non VGT turbo's will have an actuated flap to choke off the exhaust and create back pressure.
Which also works well for engine braking.
Volvo engines up to the newer D13 used a potato (Exhaust Pressure Governor) and compression brake (Volvo Compression Brake) The EPG was then used to drive the EGR when that came out.
Now they just use a VGT to drive the EGR and is the 1st stage of engine braking.
The compound turbo D13 uses a pair of regular turbos with a potato.
PACCAR uses a potato, VGT turbo and PAC brakes.
Turbo's with a VGT close off the vanes creating back pressure, which is needed to drive the EGR.
Non VGT turbo's will have an actuated flap to choke off the exhaust and create back pressure.
Which also works well for engine braking.
Volvo engines up to the newer D13 used a potato (Exhaust Pressure Governor) and compression brake (Volvo Compression Brake) The EPG was then used to drive the EGR when that came out.
Now they just use a VGT to drive the EGR and is the 1st stage of engine braking.
The compound turbo D13 uses a pair of regular turbos with a potato.
PACCAR uses a potato, VGT turbo and PAC brakes.