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Use 2.25 piping and you will regain most back pressure.

You can get the Y pipe adapter kit. But those kits are not true duals. They come with minimal gains. Like +1-3 hp.

True duals such as 2 straight pipes, or an H pipe will loose a 'little' backpressure but not much if you stay with 2.25 piping. You may not even notice it.
Also with true duals. You will see higher gains as you start modding your car since they exhaust will flow better.
 
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