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-079 Type 1 Muffler for Bluebird Bus 10" x 43" Long 4" IN-OUT

MSRP: $637.39

$322.39

M-087 Type 1 Muffler for Freightliner Bus 11" x 36" 4" IN-OUT

ShuttleWorth Type 1 Truck Muffler for Freightliner 11" x 36" 4" IN-OUT M-087

MSRP: $507.00

$293.00

Grand Rock M-102 Type 1 Muffler 9" x 44.5" Body 5" IN-OUT 51" Overall

MSRP: $509.00

$349.00

Grand Rock M-115 Type 3 Universal Truck Muffler 10" x 15" x 26" Long 4" IN-OUT

MSRP: $817.00

$617.00

Nelson Aftermarket M-116 Type 3 Oval Muffler 10" x 15" x 36" Long 5" IN-OUT

MSRP: $751.00

$484.00

M-117 Type 2 Oval Sterling Muffler 10" x 15" x 36" Long 5" IN-OUT

Grand Rock Type 2 Oval Sterling Muffler 10" x 15" x 36" Long 5" IN-OUT M-117

MSRP: $712.00

$442.00

Grand Rock M-121 Short Oval Muffler 10" x 15" x 26" Replaces MFM12-040-171

MSRP: $479.00

$390.00

Grand Rock MOM12-0450-171 Oval Muffler 10" x 15" x 44" Body 2037707C1

MSRP: $837.00

$555.00

Grand Rock 3530358C1 Oval Muffler 10" x 15 x 42" Body 5" IN/6" OUT

MSRP: $868.00

$720.00

Grand Rock M-124 Type 3 Oval Muffler 12" x 15" x 30.3" Long 4" IN - 5" OUT

MSRP: $1,152.00

$780.00

Grand Rock M-125 Type 2 Oval Thomas Muffler 10" x 15" 34" Long 4" IN-OUT

MSRP: $509.00

$339.00

Grand Rock M-127 Type 1 Muffler 8.5" Round 4" Inlet-Outlet for Mack R Model

MSRP: $382.00

$205.00

633 products total