Mack MP8/Volvo D13 21401835 Turbo Diffuser Pipe PAI 805079OEMCROSS REFERENCE: 21401835 APPLICATION: Mack MP8 Volvo D13 Multiple Use Application. DETAILS: Genuine Part BRAND: PAI 805079OEM Mack MP8 Volvo D13 21401835 Turbo Diffuser Pipe PAI 805079OEM. Replacement truck parts and aftermarket truck parts. Maintains steady turbo airflow. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified company with over 50 years of experience in the heavy duty truck parts