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I've noticed that a difference in size between upipes. The hks one is much smaller that the perrin and so on. So is it better to have the larger one. Or does the smaller one create more air flow?
 

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I know up pipe size is very critical, but i don't know the proper size and taper for the WRX. If your up pipe is too big the exaust isnt moving fast enough to spin the turbo up quick, and you will get major lag.
If the up pipe is too mall you will get a big exaust restriction, and i know it will make the car perform badly, but i dont know in what way.
 
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