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Back pressure is not the issue. It is velosity of scavenging.
The exhaust works like a syphon, and it helps scavenging the burnt gasses from the combustion chamber, and allow the in-flow of fresh oxygen and fuel.
If you have a leak in your exhaust system in the wrong place, it can work the same way as a leak in a syphon. It upsets the operation.
Changing the diameter of the pipe can help or spoil the scavenging effect, depending on the volume and velocity of the engine's pumping capacity.
That is what a tuned exhaust system is all about.
This is an extremely simplified discription.
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'88 Corolla, AE92 SR-5, 7A-FE swap/GT-S suspension
'87 Corolla, AE82 FX-16, 4A-GZE swap (autocrosser)
'03 Tundra 4X4 Access Cab, (FX tow vehicle/Home Depot runner)
Modification: Changing something to what you thought it should have been from the start!
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