Grand Rock

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

MSRP: $382.00

$205.00

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20458817 Mack Vision & CH 10" Round x 44.5" 5" Inlet-Outlet M-130

Grand Rock 20458817 Mack Vision & CH 10" Round x 44 with 5" Inlet-Outlet M-130

MSRP: $378.00

$298.00

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Grand Rock Mack Granite & R Model Muffler 10" Round x 44" 4" Inlet - 5" Outlet

MSRP: $488.00

$246.00

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Grand Rock 9" Round Hi-Flow Truck Muffler that is 44.5" Long with 4" IN/OUT D13-4590

MSRP: $382.00

$196.00

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Grand Rock M-132 Type 1 Muffler 9" Round x 44.5 " Body 5" In-Out 51" Overall

MSRP: $366.00

$256.00

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M-136 or 10050 Type 1 Muffler 10" x 36" Body 5" ID Inlets - Great For Dump Trucks

Grand Rock M-136 or 10050 Type 1 Muffler 10" x 36" Body 5" ID Inlets Dump Trucks

MSRP: $610.00

$380.00

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Grand Rock M-139 Type 2 Muffler 8.5" Round x 31" 3" IN-OUT

MSRP: $336.00

$246.00

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M-1436 Type 1 Diesel Muffler 14" Round 36" Long 5" IN-OUT

Grand Rock 14" Round Diesel Muffler 36" Long 5" IN-OUT M-1436

MSRP: $1,927.00

$1,227.00

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Grand Rock M-144 Type 1 Resonator 9" x 10" with 4" Inlet-Outlet

MSRP: $264.00

$182.00

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M-145 Type 1 Resonator 9" Round x 10" long with 5" IN-OUT

Grand Rock 9" Round Resonator x 10" long with 5" IN-OUT M-145

MSRP: $305.00

$205.00

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Grand Rock M-147 Type 2 Oval Thomas Muffler 10 x 15 x 26" 5" IN-OUT

MSRP: $511.00

$411.00

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Grand Rock Mack DM Muffler 10 x 15 Oval 4" Inlet 3.8" OD Outlet 16" long

MSRP: $362.50

$290.00

2084 products total

OUR MISSION STATEMENTTo our valued customers, At Grand Rock, we promote and work hard every day to provide our customers with the highest possible solutions, while maintaining good business values. We value our people, encourage their development and reward their performance. Our improved environmental outcomes can ride the coattails of our lean culture change; this is a win for our business, our customers, and a win for environmental improvement.We have the widest selection of exhaust products and for over 40 years our quality, dedication, customer service and efficiency have been put to a test, and after all those years we can proudly say that we are ready to take another step with our customers towards a promising future.Thank you, Grand Rock Team