4 Inch Diameter

4 Inch Air Intake Hoses

4 Inch Air Intake Pipes

4 Inch Brackets

4 Inch Clamps

4 Inch Couplers & Connectors

4 Inch Diverter Boxes

4 Inch Other Products

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Grand Rock M-625 Type 4 Bluebird Bus Round Muffler 11" x 42" 4"IN-OUT

MSRP: $811.00

$451.00

Grand Rock M-626 Type 4 Muffler for Thomas School Bus 11 x 33.5 4" IN-OUT

MSRP: $812.00

$442.00

Grand Rock M-630 Type 1 Muffler 6" Round x 24" Body 4" In-Out 30" Overall

MSRP: $437.00

$287.00

ShuttleWorth M-724 Type 4 Round Muffler 11" x 36" 4" IN-OUT

MSRP: $384.00

$322.00

M-751 International 10" x 15" Oval Muffler 4" Inlet - 5" Outlet

Grand Rock 10" x 15" Oval Muffler for International 4" Inlet - 5" Outlet M-751

MSRP: $607.00

$414.00

Grand Rock M-824 Type 1 Powerflow Muffler 8" Round x 15" Body 4" IN-OUT 21.5 Overall

MSRP: $338.00

$208.00

Grand Rock 25158346 Mack 304 SS Flex Exhaust 4" x 12.5" 4ME-2786P3

MSRP: $105.00

$75.00

Grand Rock 4ME-4925 Mack R & RD 4" Exhaust Elbow MK-4925

MSRP: $408.00

$298.00

Grand Rock 4ME-4926 Mack R & RD Model 4" Exhaust Elbow MK-4926

MSRP: $449.00

$339.00

Grand Rock 4ME-4969 Mack 4" OD Exhaust Elbow R & RD Model MK-4969

MSRP: $512.00

$342.00

Grand Rock 4ME-4970 Mack R & RD Model 4" Exhaust Elbow MK-4970

MSRP: $514.00

$344.00

Grand Rock 4ME-583M2 Mack CH & CL Chrome Exhaust Elbow MK-583M2C

MSRP: $583.00

$515.00

633 products total