My lude is very hesitant to take off from the line. It feels very sluggish until about 2500 to 3000 rpm. From there it accelerates very nicely. Does this sound normal? I just got a tune up, cleaned my K&N filter, got an oil change, changed my pcv valve, and my fuel filter. I'm thinking my exhaust could be hurting my low end torque badly. I'm running the stock manifold with a 2.25" straight pipe back to a 2.5" inlet 4"outlet 6" round muffler. No cat. Would welding in a universal replacement cat help my torque?