Driving in low gears when I take my foot off the gas my car feels like it's slightly struggling or bogging down. When I rip on the car it's still fast but I only experience this feeling when I let go of the gas pedal. Is it a possibility I have an exhaust leak, clutch is bad, dirty air filter, or pulley belts need to be tighten. I feel that my car was more responsive before and I can't stand the way it feels. I just put in a new clutchmaster stage 1 5,000 miles ago so I'm not sure if that's the problem. Thanks guys for your help