My VX had and Intake on it when I bought it, I removed it to put a stock intake an box on, the power curve is much smoother and there there seemed to be a noticeable difference in low end power...I think if you switch the intake and decrease the low end power you will have to in turn use more power and more fuel...I'd stick with a stock intake...
As for exhaust, mine came with a muffler shop system on it, no resonators just straight from the car back to a muffler, I like how it sounds not raspy and not overly loud, I never had a stock system on the car so I can't complair but I don't think you will see any major negative effects from changing the exhaust just don't go overly large...2 1/4 ideally maybe even 2 1/2...I know Dan has an Apexi WS2 on his VX and it sounds nice and he gets fairly decent mpg numbers still...HTH GL
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