CATALOG NUMBER 17 Part Number Description OE # OE Truck Model Freightliner GRRFL-13974 5"2-BEND OD/OD/OD Y-PIPE ALZ A04-13974-000 Classic GRRFL-16460-009 ELBOW,5"33.5DEG OD/FLARE PYRO ALZ 04-16460-009 Classic GRRFL-16639-001 ELBOW,5"35DEG ID/OD ALZ 04-16639-001 Classic GRRFL-16885-041 5" 2-BEND OD/ID/ID Y-PIPE ALZ 04-16885-041 Classic GRRFL-17094-012 5"2-BEND OD/FLARE TURBO ALZ 04-17094-012 FLD GRRFL-17094-014 5"2-BEND OD/FLARE TURBO ALZ 04-17094-014 FLD GRRFL-17094-016 5"2-BEND OD/FLARE TURBO ALZ 04-17094-016 FLD GRRFL-17123-024 5"2-BEND OD/FLARE TURBO ALZ 04-17123-024 Century and Columbia GRRFL-17476-000 ELBOW,5"90DEG OD/OD MOUNT ALZ A04-17476-000 Century and Columbia GRRFL-21016-008 5" 2 BEND TURBO PIPE 04-21016-008 Columbia Part Number Description OE # OE Truck Model International/ Navistar GRRIH-1803C1 5"2-BEND OD/OD FLAT ALZ 3541803C1 N/A GRRIH-275-5C ELBOW,5"90DEG OD/R4"OD CHR 598275C1 9300 Series GRRIH-286C1 5" ID/4"OD/OD Y-PIPE ALZ 598286C1 9300 GRRIH-4821C3 4"2-BEND FLARE/5"OD TURBO ALZ 3564821C3 9400 to 9900 Series GRRIH-CUP 5" + 6" ALZ, 2-BEND, ID/ID Grand Rock design Muffler eliminator Part Number Description OE # OE Truck Model Kenworth GRRKW-14122 5"2-BEND OD/OD PIPE ALZ K180-14122 W900B, W900L, T600, T800 GRRKW-14764L 5"2-BEND ID/OD PIPE LEFT ALZ K180-14764L W900B, W900L, T600, T800 GRRKW-14764LC 5"2-BEND ID/OD PIPE LEFT CHR K180-14764LCP W900B, W900L, T600, T800 GRRKW-14764R 5"2BEND ID/OD PIPE RIGHT ALZ K180-14764R W900B, W900L, T600, T800 GRRKW-14764RC 5"2-BEND ID/OD PIPE RIGHT CHR K180-14764RCP W900B, W900L, T600, T800 GRRKW-14766 5"3-BEND OD/OD/OD Y-PIPE ALZ K180-14766 W900B, W900L, T600, T800 GRRKW-15565 ELBOW,5" 22DEG OD/FLARE PYRO ALZ K180-15565 W900B, W900L, T600, T800 GRRKW-17915 ELBOW,5"23DEG OD/FLARE PYRO ALZ K180-17915 T600,T800,W900 w/ Cat engine GRRKW-18028 5"2-BEND OD/OD/OD Y-PIPE ALZ K180-18028 W900B GRRKW-18531 ELBOW,5"26DEG OD/OD ALZ K180-18531 Early Aerocab GRRKW-18613 5"2-BEND OD/OD/OD Y-PIPE ALZ K180-18613 Early Aerocab GRRKW-ACUP 5"2-BEND ID/ID U-PIPE ALZ Grand Rock Design Used to replace mufflers on Aerocabs DIRECT OE REPLACEMENT PIPES GRRIH-1803C1 GRRKW-14122 GRRFL-17123-024
MIDWESTWHEEL.COM MEMBER KANSAS CITY 5801 E. Front St. Main ....(816) 471-1552 Parts....(800) 821-7402 JOPLIN 2424 Stephens Blvd. Main ....(417) 717-6022 Parts....(866) 318-9111 SPRINGFIELD 812 Lillian Dr. ∙ Strafford, MO Main ....(417) 429-2476 Parts....(800) 785-3705 SIOUX CITY 1819 4th St. Main ....(712) 252-7969 Parts....(800) 943-3534 CEDAR RAPIDS 200 50th Ave. S.W. Main ....(319) 365-4453 Parts....(800) 332-5435 DES MOINES 1436 E. Ovid Ave. Main ....(515) 265-1491 Parts....(800) 888-0248 CLEAR LAKE 840 Hwy. 18 W. Main ....(641) 357-7101 Parts....(800) 397-5630 DAVENPORT 8502 Northwest Blvd. Main ....(563) 322-2671 Parts....(800) 553-1886 OMAHA 9770 S 142nd Street, Suite 1 Main ....(531) 239-3050 Parts....(800) 322-8757 NEBRASKA IOWA MISSOURI November 14, 2025 (17Grand Rock OE Parts Flyer) Part Number Description OE # OE Truck Model Peterbilt GRRPB-13002 ELBOW,5"85DEG OD/FLARE PYRO ALZ 14-13002 3.57377E+11 GRRPB-13055Y 5"3-BEND ID/OD/OD Y-PIPE ALZ 14-13055 379 Conventional GRRPB-13056C ELBOW,5"56DEG OD/OD CHR 14-13056CP 379 Conventional GRRPB-13394 ELBOW,5"90DEG ID/OD,W/FLAT; ALZ 14-13394-202 379 1994 to 2007 GRRPB-13430 ELBOW5" 58DEG OD/FLARE PYRO ALZ 14-13430 377378379 GRRPB-13822 5"2-BEND OD/FLARE TURBO PYRO ALZ 14-13822 379 GRRPB-13845RC 5"2-BEND OD/OD PIPE RIGHT CHROME 14-13845RCP 377 GRRPB-15073 5"2-BEND ID/OD FLAT ALZ 14-15073 379 standard hood GRRPB-15329 ELBOW,5"62DEG OD/FLARE PYRO ALZ 14-15329 379 Conventional GRRPB-15353Y 5"3-BEND OD/OD/OD Y-PIPE ALZ 14-15353-150 379 Part Number Description OE # OE Truck Model Volvo GRRVG-0978 5"2-BEND OD/FLARE PYRO ALZ 8080978 VN and VNL GRRVG-1845 5"2-BEND OD/FLARE PYRO TURBO ALZ 8071845 N/A GRRVG-3286 5"2-BEND ID/OD PIPE ALZ 23509-3286 VN and VNL GRRVG-6419 5" 3-BEND 0D/OD/OD Y-PIPE ALZ 20457108 VN and VNL GRRVG-6745 5"2-BEND OD/FLARE PYRO TURBO ALZ 20446745 VN and VNL GRRVG-7104 5"2-BEND OD/OD PIPE ALZ 20457104 VN and VNL GRRVG-7107 5"3-BEND OD/OD/OD Y-PIPE ALZ 8078159 VN and VNL GRRVG-7109 5"2-BEND OD/OD PIPE ALZ 20457109 VN and VNL GRRVG-9180 ELBOW,90DEG ID/OD ALZ 20489180 VN and VNL GRRVG-9649 5"2-BEND OD/R4"FLARE PYRO ALZ 20779649 VN and VNL GRRVG-9180 GRRVG-6419 GRRVG-1845 GRRPB-15073 GRRPB-13394 GRRPB-15329 GRRPB-13002
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