So I've read the great reviews and thinking of getting the autocal. My truck has 5300 on it now and I just changed exhaust. I put a race bullet with 3 inch dumped over axle. It seems I've lost some low torque. From a stop with the stock muffler, I could punch it and it shift around 2800 rpm. Now it pushes 4000 rpm before shifting. Cruising in traffic at 30 mph and 1200 rpm today, I punched it and it's sluggish/boggy. The acceleration from 1200-2000 rpm seems slower. It didn't do that with stock muffler. Can the autocal take care of these issues?