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INTRODUCING THE NEW QP INTERNAL MUFFLERS - DUAL EXHAUST
the latest, most efficient sound reduction system for our 5", 6" or 7" DUAL (non-reduced) straight stacks
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• Same dBA as Stock... Sound legal everywhere1
• Increased horsepower, faster turbo spool-up, no turbo lag!
• Increased Fuel Mileage2
• Tax Deductible3
• Easily Installed! Two holes in each stack required
• Patented 2004
1 During acceleration only. Engine brakes are still loud with these mufflers. See dBA chart below
2 See mileage statements below
3 Repair/maintenance of a vehicle used in business is tax deductible
* These results are BEFORE quarterly fuel tax payments. Figure in for ADDITIONAL savings.
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PERFORMANCE
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FUEL MILEAGE STATEMENTS
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NAME & ENGINE
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FUEL MILEAGE
WITH STOCK
10" MUFFLERS
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FUEL MILEAGE
WITH
QP MUFFLERS
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MILEAGE
GAIN
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%
OF
GAIN
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Davis Newman
360 hp 12.7 Detroit
60 Series, 5" Dual Stacks
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6.41 mpg
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6.79 mpg
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0.38 mpg
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5.9
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Mike Piispanen
525 hp 12.7 Detroit
60 series, 6" Dual Stacks
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5.85 mpg
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6.40 mpg
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0.55 mpg
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9.4
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Rick Dearing
525 hp N14 plus
Cummins, 7" Dual Stacks
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5.96 mpg
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6.35 mpg
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0.30 mpg
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6.5
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Mark Simpson
400 hp N14
Cummins, 5" Single Stack (not recommended)
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5.75 mpg
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5.92 mpg
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0.17 mpg
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3
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These are average gains, depending on load, weights and weather conditions. These may change, but overall there has been a gain across the board. Engines not listed have not yet been tested. As we get more feedback and results, we'll update everyone with the fuel savings!
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FUEL COMPARISON TEST
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Owner: Rick Dearing
525 HP N14 PLUS Cummins
7" stacks and QP-7 Mufflers
Based on 100,000 miles per year
Regular mileage: 5.96 MPG - Fuel is 16,778 Gallons @ $1.80 per gal. for 100,000 miles = $30,200 with Regular mufflers
Improved mileage with QP Mufflers
6.35 MPG (gain of 6.5%) - Fuel is 15,384 Gallons @ $1.80 per gal. for 100,000 miles = $27,691
SAVINGS OF $2509.OO IN THE FIRST YEAR ALONE!
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DRIVE TIRE HORSEPOWER RESULTS
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ENGINE RPM
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STOCK 10"
MUFFLERS
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QP-5
5"
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QP-6
6"
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QP-7
7"
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ROAD SPEED
MPH
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1400
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383
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393
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415
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414
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57
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1500
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406
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427
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408
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413
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60
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1600
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431
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432
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424
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426
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63
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1700
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418
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415
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421
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418
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67
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1800
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416
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424
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414
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419
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71
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1900
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387
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411
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402
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406
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73
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Test Conditions
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7:00 AM
68° Low
Humidity
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10:45 AM
85° Moderate
Humidity
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1:50 PM
97° High
Humidity
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3:12 PM
98° High
Humidity
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*Tests were conducted on a calibrated chassis dyno at Williams Diesel; Hubbard, Ohio. The truck was in 18th gear, direct drive with the engine fan on; 100% load on the wheels. On four different engines, the turbo lag was GONE. Everyone stated that the turbo spooled up FAST with a touch of the accelerator pedal.
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QUIET
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TOTAL VEHICLE TRUCK NOISE REGULATIONS
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US DOT
Federal Motor Carrier
Safety Administration
Article #325.7
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US EPA
Article #205.52
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California Dept. of
Motor Vehicles
Code #27204
Sect. #1 Jan. 2000
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83 dBA
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1979 - 1987
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83 dBA
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1988 +
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80 dBA
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1981 - 1987
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83 dBA
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1988 +
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80 dBA
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* US EPA Article #205.58(C) states that mufflers can be changed as long as there is no increase in noise. California DMV Article #27150 and #27151VC states that exhaust can be modified as long as it doesn't increase or amplify the sound.
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Test Tractor: 2000 Peterbilt 379 Conventional with sleeper, Cummins N14 plus 525 hp electronically controlled engine. 50% tread depth Bridgestone M726 drive tires.
Test Trailer: 2000 Stoughton 102" x 53' van with 65% smooth tread matched tires, loaded with a 35,000 pound net load.
Drive by with Dual OEM Mufflers - 80 dBA
Drive by with 5" Straight Pipes and NO Mufflers - 97 dBA
Drive by with 5" QP Mufflers inside 5" straight pipes - 80 dBA
Drive by with 6" QP Mufflers inside 6" straight pipes - 80 dBA
Drive by with 7" QP Mufflers inside 7" straight pipes - 79 dBA
Test was conducted on a concrete road in an industrial park with buildings, trees, etc., giving a "REAL LIFE" simulation, NOT controlled lab results. These tests are for COMPLETE vehicle sound, not just exhaust sound levels. Drive-by tests were measured from 50' away, 6' high, 34 mph with the engine under acceleration at the loudest point of the pull. Engine brakes are still loud with our QP Mufflers. Other engines in different trucks (cabover vs sleek aerodynamic conventionals) with other trailer types (dump, flat with side kit, etc.) along with the type and condition of tires will change the overall sound output. Test conditions will have a huge effect on sound. A busy, concrete interstate in a congested area will be louder than a rural, asphalt 2-lane road.
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FAMILIAR SOUNDS ON THE dBA NOISE SCALE
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Whisper - 20 dBA
Quiet Residential Neighborhood - 50 dBA
Normal Speach - 60 dBA
Busy Office - 80 dBA
Chain Saw @ 50' or Punch Press - 110 dBA
Jet Plane @ 50' - 130 dBA
Pain Threshold - 150 dBA
Each increase of 10 dBA doubles the sound level. For example, 97 dBA is TWICE as loud as 87 dBA.
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For maximum performance we recommend the following MINIMUM sizes of QP's for your Application.
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ENGINE SIZE
IN LITRE
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ENGINE SIZE
IN CUBIC INCH
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HORSEPOWER
RANGE
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RECOMMENDED
MINIMUM
SIZE
QP PART#
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5.9L
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360
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ANY
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QP-5LC*
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7.3L
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445
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ANY
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QP-5LC*
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8.3L
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506
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ANY
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QP-7LC*
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10L
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610
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ANY
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QP-5LC
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11L
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672
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ANY
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QP-5LC
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11.1L
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678
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ANY
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QP-5LC
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12L
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733
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ANY
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QP-6LC
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12.7L
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745
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ANY
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QP-6LC
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13L
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794
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ANY
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QP-6LC
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14L
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855
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ANY
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QP-6LC
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14.6L
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892
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ANY
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QP-6LC
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14.7L
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898
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ANY
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QP-6LC
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15L
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916
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up to 400
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QP-6LC
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15L
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916
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400+
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QP-7LC
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16L
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977
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ANY
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QP-7LC
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* A single QP can be used for these smaller engines. To determine Litre Size, take your cubic inch ÷ 61.07 = Litre Size (855ci ÷ 61.07 = 14 Litre)
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Grand Rock parts used on a heavy duty truck exhaust system are warranted against defective material and workmanship for a period of 1 year from the date of shipment. It is the dealer's responsibility to inform its customers of our warranty conditions and of proper installation techniques. Grand Rock cannot be held responsible for damage done as a result of improper installation. If a part is determined to be defective, Grand Rock reserves the right to repair only and return the part when the part has been modified, altered, or otherwise damaged. Grand Rock and its authorized distributors cannot be held liable or responsible for any equipment failure, damage, downtime, loss of revenue, lodging, meals, transportation, equipment rentals, etc., caused by any of our products.
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FOR DUAL EXHAUST ONLY
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DIMENSIONS AND DISTRIBUTOR NET COSTS
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OUR
PART #
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TO FIT
PIPE DIA.
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OVERALL
LENGTH
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QP-5
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5"
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45"
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QP-6
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6"
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45"
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QP-7
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7"
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45"
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