Mufflers/Resonators - Grand Rock Truck Exhaust Systems
Mufflers/Resonators - Grand Rock Truck Exhaust Systems
Mufflers/Resonators - Grand Rock Truck Exhaust Systems
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MUFFLERS, CONVERTERS, & SHIELDS<br />
QP (Quiet Performance) Internal <strong>Mufflers</strong><br />
(For Dual <strong>Exhaust</strong> Only!)<br />
(muffler only, stack ordered seperately)<br />
The most efficient integral sound reduction<br />
system for 5", 6" or 7" DUAL<br />
(non-reduced) straight stacks<br />
• Quiet as Stock <strong>Mufflers</strong>*<br />
• Meets Federal and California Sound Levels<br />
• 6.2% Fuel Mileage Increase (avg.)<br />
• 3% HORSEPOWER Gain<br />
• No Turbo Lag, Faster Acceleration<br />
• Easy Installation<br />
• Fits Inside 5", 6" or 7" Stacks (dual only)<br />
• Straight Stack Look WITHOUT the Noise!<br />
* Driving and Acceleration only, NOT engine braking.<br />
For Dual <strong>Exhaust</strong> Only!<br />
55<br />
1-800-321-3674<br />
www.grandrock.com
MUFFLERS, CONVERTERS, & SHIELDS<br />
QP Sound Data<br />
TOTAL VEHICLE TRUCK NOISE REGULATIONS<br />
US DOT Federal Motor Carrier Safety<br />
Administration Article #325.7 US EPA Article #205.52<br />
California Dept. of Motor Vehicles<br />
Code #27204 Sect. #1 Jan. 2000<br />
83dBA 1979-1987 83 dBA 1981-1987 83 dBA<br />
1988+ 80 dBA 1988+ 80 dBA<br />
*US EPA Article #205.58(C) states that mufflers can be changed as long as there is no increase in noise.<br />
California Article #27150 and #27151VC states that exhaust can be modified as long as it doesn’t increase or amplify the sound.<br />
1-800-321-3674<br />
www.grandrock.com<br />
QP Application<br />
FOR MAXIMUM PERFORMANCE WE RECOMMEND THE FOLLOWING<br />
MINIMUM SIZES OF QP'S FOR YOUR APPLICATION.<br />
ENGINE SIZE IN<br />
LITRE<br />
ENGINE SIZE IN<br />
CUBIC INCH<br />
HORSEPOWER<br />
RANGE<br />
RECOMMENDED MINIMUM<br />
SIZE QP PART#<br />
5.9L 360 ANY QP-5LC*<br />
7.3L 445 ANY QP-5LC*<br />
8.3L 506 ANY QP-6LC<br />
10L 610 ANY QP-5LC<br />
11L 672 ANY QP-5LC<br />
11.1L 678 ANY QP-5LC<br />
12.7L 745 350+ QP-6LC<br />
13L 794 350+ QP-6LC<br />
14L 855 ANY QP-6LC<br />
14.6L 892 UP TO 350 QP-6LC<br />
14.6L 892 350+ QP-6LC<br />
14.7L 898 UP TO 350 QP-6LC<br />
14.7L 898 350+ QP-6LC<br />
15L 916 UP TO 400 QP-6LC<br />
15L 916 400+ QP-7LC<br />
16L 977 UP TO 400 QP-7LC<br />
16L 977 400+ QP-7LC<br />
*A single QP can be used for these smaller engines.<br />
To determine Litre Size, take your cubic inch ÷ 61.07 = Litre Size (855ci ÷ 61.07=14Litre)<br />
For Dual <strong>Exhaust</strong> Only!<br />
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