OP, your friend actually gets the point. Put it in this way, if you can't beat a M3 in a stock 370z, you still can't beat them in a 370z with all the bolt on mods... The intake and exhaust only gains you at higher end but sacrifice a little on lower end. So street driving you won't feel a sh!t unless you don't mind to rev the engine up high all the time... It's the nature of NA cars... His factory turbocharged WRX will probably gain much more on the exhaust and intake mods.
Having said that, mod is fun and the exhaust will give you the awesome sound so it's not total waste of money.
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