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backpressure is bad, regardless of the asipration being used or displacement of an engine. it is the scavenging effect of a well tuned exhast system that can be lossed when someone goes for an overly large exhast. this is whya true exhast upgrades replaces all the components at once and has taken into account the operating chartersistic of the motor. reality is that they are not as simple of an upgrade as most people think.
as for the 2.2, it realy is a gutless engine no matter what you do to it. power of a 3, drinks fuel like a 6. however the engine is basicly the same as the 2.2 used in caviliers of the same time period, so you cna look towards those for an idea of perfroamnce upgrades.
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