Grand Rock Muffler QP-5LC

Grand Rock does not recommend a single stack setup with the quiet Performance Internal mufflers. Customer have tried it, but the results have not been as good as with a dual stack setup, 3% and lower gains. Because Grand Rock does not recommend it, we do not either. Give us a call if you have any questions.

• 3% MINIMUM MPG GAIN.
• Quiet Performance Muffler
• 7.28% Fuel Mileage Increase (avg.)
• Much Quieter then open stacks and as quiet as stock. Engine brakes will still be loud.
• Meets Federal and California Sound Levels
• Heavy Gauge, 100% welded construction
• No Turbo Lag, Faster Acceleration
• Easily Installed, Bolts in place
• Patented 2004
• Easy Install! Two holes in each stack is required.
• Tax Deductible- Repair/maintenance of a vehicle used in business is tax deductible.