Quote Originally Posted by stealthrt
I guess you didn't read any of that?

You don't want to increase "back pressure" to make low end torque, you want to increase the pressure drop at low RPM. You have to make an exhaust selection based on where you want your power though, as your car will flow less air at 1000 RPM than it will at 6000 RPM. Therfore if you have an exhaust selected based on 6000 RPM worth of exhaust gasses, your pressure change at 1000 RPM will be greatly reduced..

Read the entire article again if you don't understand with emphasis on this portion.
so will like a 2 1/4" exhaust give me more backpressure?