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Reducing the diameter of your exhaust pipe will do nothing for your torque at low rpm. That's a myth.
The myth got started because back in the carburetor days, adding headers and a performance exhaust to a car leaned it out, causing a loss of torque at low rpm's. Thus the myth that if increasing the size of your exhaust lowers low end torque, then decreasing the size of your exhaust must then increase torque, right?
The real solution to the issue of lowered torque with a big exhaust was due to the headers actually doing their job and lowering backpressure, which leaned out the air/fuel mix. Once you re-jetted the carb to account for the headers, you INCREASED torque all the way across the rpm band.
With modern fuel-injected cars, the computer will compensate for the reduced backpressure automatically so there will be no loss of torque.
About the only thing you could do that would hurt your torque output would be to reduce the diameter of your exhaust system. It will increase your backpressure, causing your engine to work harder to pump the exhaust out the back.
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