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Thumbnail Filmstrip of 1999.5-2003 7.3L Powerstroke Billet CHRA Replacement With s300 Turbine Wheel KC 300857 Images
The KC 300857 is a drop-in center section for a 1999.5–2003 7.3 Powerstroke GTP38. It replaces the stock CHRA and adds an S300 turbine wheel and a KC billet compressor wheel. Your housings stay.
The stock center section is what fails: shaft play, oil in the intake, and a compressor wheel that has rubbed the housing. This cartridge bolts into those housings. The larger turbine and billet compressor are what KC uses for quicker spool and more boost than a stock rebuild. It is a journal-bearing design, so it can be rebuilt later. Wheels are already installed. The compressor housing, turbine housing, and wastegate are not included. DIY installs are not covered by KC’s warranty.
It fits late-1999.5 through 2003 Super Duty 7.3 trucks with a stock GTP38. Early 1999 and OBS TP38 housings are not this cartridge.
Fitment
- 1999.5–2003 Ford 7.3L Powerstroke
- Stock GTP38 housings
- S300 turbine wheel and KC billet compressor
- Journal bearing
- Housings not included
- Does not fit the early TP38
Replace the pedestal O-rings and the compressor-housing O-ring while the turbo is apart. A new cartridge on old seals will still leak oil and boost.
The KC 300857 is a drop-in center section for a 1999.5–2003 7.3 Powerstroke GTP38. It replaces the stock CHRA and adds an S300 turbine wheel and a KC billet compressor wheel. Your housings stay.
The stock center section is what fails: shaft play, oil in the intake, and a compressor wheel that has rubbed the housing. This cartridge bolts into those housings. The larger turbine and billet compressor are what KC uses for quicker spool and more boost than a stock rebuild. It is a journal-bearing design, so it can be rebuilt later. Wheels are already installed. The compressor housing, turbine housing, and wastegate are not included. DIY installs are not covered by KC’s warranty.
It fits late-1999.5 through 2003 Super Duty 7.3 trucks with a stock GTP38. Early 1999 and OBS TP38 housings are not this cartridge.
Fitment
1999.5–2003 Ford 7.3L Powerstroke
Stock GTP38 housings
S300 turbine wheel and KC billet compressor
Journal bearing
Housings not included
Does not fit the early TP38
Replace the pedestal O-rings and the compressor-housing O-ring while the turbo is apart. A new cartridge on old seals will still leak oil and boost.[...]
The KC 300857 is a drop-in center section for a 1999.5–2003 7.3 Powerstroke GTP38. It replaces the stock CHRA and adds an S300 turbine wheel and a KC billet compressor wheel. Your housings stay.
The stock center section is what fails: shaft play, oil in the intake, and a compressor wheel that has rubbed the housing. This cartridge bolts into those housings. The larger turbine and billet compressor are what KC uses for quicker spool and more boost than a stock rebuild. It is a journal-bearing design, so it can be rebuilt later. Wheels are already installed. The compressor housing, turbine housing, and wastegate are not included. DIY installs are not covered by KC’s warranty.
It fits late-1999.5 through 2003 Super Duty 7.3 trucks with a stock GTP38. Early 1999 and OBS TP38 housings are not this cartridge.
Fitment
- 1999.5–2003 Ford 7.3L Powerstroke
- Stock GTP38 housings
- S300 turbine wheel and KC billet compressor
- Journal bearing
- Housings not included
- Does not fit the early TP38
Replace the pedestal O-rings and the compressor-housing O-ring while the turbo is apart. A new cartridge on old seals will still leak oil and boost.
Q
Bailey • 02/01/2026, 9:21:28 PM
Will this bolt on to the stock housings?
A
02/02/2026, 7:04:46 PM
This replacement center section is designed to drop into your stock turbo
Q
Wes Kauppila • 06/25/2026, 9:12:40 PM
Is this cartridge assembly/turbine compatible with a truck that is not tuned and has stock injectors as well as stock intake and exhaust components?
A
06/25/2026, 9:34:05 PM
Yes.
Q
Clif • 07/15/2026, 11:45:39 PM
How will this perform with stage 1.5 injectors and hydra tuner w jellibuilt tunes
A
07/17/2026, 2:09:45 PM
Just fine.
Q
Jay • 09/17/2026, 3:53:46 PM
Is this a balanced wheel and shaft assembly?
A
09/17/2026, 3:54:41 PM
Yes.
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5/5 Stars out of 1 Reviews
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Jake G (New Hampshire) | June 8th, 2026
Quick and simple swap and came with O-rings. Quicker spool with the ZF6 and about 100 degrees cooler like advertised. I was worried about increased noise but it actually made the truck quieter on the highway. Would definitely recommend.
Proposition 65 Warning Information -
P65Warnings.ca.gov
Fits: 7.3 Powerstroke 1999.5-2003
California Restricted
Fits: 7.3 Powerstroke 1999.5-2003
Fits: 7.3 Powerstroke 1999.5-2003
Fits: 7.3 Powerstroke 1999.5-2003