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By using the new QP Muffler, Grand Rock guarantees a minimum of 3% gain in mpg or you money back!

Grand rock guarantees a minimum of 3% gain in you mpg or your money back!

That's right, Grand Rock can help with our patented, tested and proven QP series of mufflers. We have saved Fleets mor then 2,000,000 gallons of fuel in the last five years! with the cost of diesel at a record high, everyone is looking at ways to squeeze as many miles out of a gallon as possible.

What have you got to lose other than more profit? We have been in the exhaust business for more than thirty-one years. We stand behind our products and our guarantee, of at least minimum of 3% gain in mpg. Call today, and start saving!

    Sincerely,
GRAND ROCK CO., INC

Truck Exhaust Systems

Our mufflers will replace the offset pipe in-front of the stock muffler and will line straight up with the inlet and outlet pipes.

 

QP Muffler Results
Walled Lake Schools (MI)
Bus # MFG Engine Muffler/Fuel 2006 Muffler/Fuel 2007 4/1/06-5/18/06 4/1/07-5/18/07
28 2001 Thomas (FTL) 65 Pass 3126 CAT OEM/Std. Diesel QPM-851/ULSD 6.28 MPG 7.97 MPG (+27%)
133 2004 Blue Bird (INTL) 77 Pass DT-466 OEM/Std. Diesel QPM-851/ULSD 5.08 MPG 6.33 MPG (+24.6%)


Kenston Schools (OH)
77 2003 Thomas (FLT) ISB OEM/Std. Diesel OPM-851/ULSD 7.6 MPG 8.8 MPG (+16%)
83 2002 Blue Bird ICS OEM/Std. Diesel QPM-851/ULSD 7.5 MPG 8.5 MPG (+13%)

Take the QP Challenge

  QP OEM Style Muffler
  • Gauge of Body (26% thicker than average)
 14 ga.  16 or 18 ga.
  • Gauge of baffles
 12 ga. 16 or 18 ga.
  • 100% Welded
 YES ?
  • Coated Welds
 YES ?
  • Heavy box to eliminate damage
 YES ?
  • Service Life
 4+ years 2-3 years
  • Guaranteed to SAVE YOU FUEL
 YES NO
  • Gauge of Brackets* (48% thicker than average)
 7 ga. (.185) 11 ga. (.125)
  • Coating of Brackets*
 Long Life Powder Coat Paint or Zinc
* With over double the service life, these mufflers will save you additional clamps, brackets, labor costs, and more.

3-1/2" inlet, 4" outlet muffler (8" diameter) = Part # QPM-851-354
4" in/out muffler (8" Diameter) = Part # QPM-851-44
5" in/out muffler (8" Diameter) = Part # QPM-851

 

School Bus Testimonial
 

Walled Lake Schools, MI:     Kenston Schools, OH:  
  Thomas with 3126 CAT 27%     Thomas with ISB Cummins 16%
  Bluebird wit DT-466 IH 24%     Bluebird with ISC Cummins 13%

 

Vehicle Qty on Road Approximate Life Cycle Approximate Miles Driven per Unit

School Buses
500,000
15 years
33,000

Truck Testimonials
Trucks, Approximately 2.8M      85,000 miles per year

Name Engine % of Gaim
     
Jay Sutch N14 Cummins 8
Bill Ellis 12.7L Detroit 19
Chris Parson C15 9.4
Jim Cummins 12.7 Detroit 8
FedEx Ground 3406 CAT 500HP 8.5
Central Transport M11 Cummins 10
AAA Trucking 3406 CAT 400HP 5.5
Avery Tank Lines Mack V Mac 2 427HP 13.5
Sandridge Foods ISX Cummins 525HP3.5 8.5
Sandridge Foods N14 Cummins 450HP 7
Truckman Corp. N14 Cummins 500HP 2.5
Truckman Corp. N14 Cummins 475HP 6
GB Express 12.7L Detroit 500HP 8.5
Tube Express 11.1L Detroit 400HP 15
Kern's Truckinig C13 CAT 7.5
Kern's Trucking C12 CAT 9
Chromer Trucking 14L Detroit 500HP 6.5

 

Vehicle Qty on Road Approximate Life Cycle Approximate Miles Driven per Unit

Trucks
2.8M
8 years
85,000

 

Quantity Sold in 4 years: QPM-1051 = 490 QPM-851 = 270 Stacks = 1072

Approximate fuel saved for a period of 4 years = Over 2,000,000 gallons


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Phone: 330-769-3067
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