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Slowing Cat

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My f5 standard has lost at least 10mph. Why??? Have been seeing speeds of 95mph and more to go. Now it struggles to reach 85 mph. Already hooked exhaust valve cables back to servo. Track has been adjusted to very loose,front skid shock spring loosened, new belt. just had reverse put in and I cant imagine that reverse gears are going to slow me down that much. Going on a trip north in a couple of weeks and need to find where i have lost my speed. I weigh about 165lbs. NEED HELP