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While there may possibly (and I'll emphasize "possibly") be gains to be had in drivability from ditching the stock intake on a stock motor, I'm still going to stick by my original statement that if you want to do this, at least do it with automotive components, not plumbing department parts.
I've made plenty of air intakes on cars (including the one on my Boxster), and always used aluminum tubing (typically from Vibrant) and silicone couplers and elbows (typically from Samco).
On the topic of smoothness, the latest studies on fluid dynamics actually show that a slightly rough surface flows better than a perfectly smooth one, due to boundary layer separation.
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Boxster S
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Threaded Mode
