Grand Rock

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M-556 Type 1 Resonator 9" x 10" x 16" 3" IN-OUT

Grand Rock M-556 Type 1 Resonator 9" x 11.5" x 16" 3" IN-OUT

MSRP: $396.00

$206.00

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Grand Rock M-557 Type 1 Muffler 9" x 34" Peterbilt 379 Extended Hood

MSRP: $510.00

$390.00

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Grand Rock M-557-0 Type 1 Muffler 9" x 34" Peterbilt 379 Extended Hood Low Restriction

MSRP: $612.00

$432.00

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Grand Rock M-595 Type 1 Universal Exhaust Muffler 9" x 20" 5" Inlets-Outlets

MSRP: $437.00

$237.00

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M-622 Type 2A Muffler Dual In-Single Out Flanged for Bluebird Chevrolet-GMC

Grand Rock Muffler Dual In-Single Out Flanged for Bluebird Chevrolet-GMC

MSRP: $917.00

$607.00

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Grand Rock M-624 Type 2 Muffler for GMC 8.5" x 30.25" 2.75 IN - 3" OUT

MSRP: $609.00

$359.00

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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

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

MSRP: $812.00

$442.00

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

MSRP: $437.00

$287.00

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Western Star Muffler 10" x 44.5" Body 6" ID IN-OUT Lo-Max (M-651)

Grand Rock Western Star Muffler 10" x 44.5" Body 6" ID IN-OUT Lo-Max

MSRP: $960.00

$493.00

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Grand Rock Ford Diesel Truck Muffler 11" x 36" 5" IN-OUT M-672 Type 6

MSRP: $738.00

$409.00

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Grand Rock M-722 Type 2A Muffler Bluebird GMC 8.7" x 30" 2.5" IN-3" OD OUT

MSRP: $713.00

$483.00

2086 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