I've got a 98 M3 w/ the Dinan chip and cold air intake. Am concidering the Supersprint or Dinan exhaust. They claim 10-15% HP & Torque increase (that would equal 24+) which seems like it would be very noticable. I'm looking for more low end torque, 0-80 acceleration speed rather than top end speed. Would an exhaust system quench my thirst? Which one has the best results? Are there any other methods to get more low end power and acceleration without dumping a grip of cash?