I like to put it this way since it was brought up again, nothing is impossible.
I made 160hp before throwing the turbo on. You just have to heavily weigh the options on dumping thousands of $$ into an NA motor trying to break 200rwhp VS just cleaning the block up with some extras and turbo'ing it. It's way easier to assist the motor with induction than trying to get it to efficiently suck in enough air by using negative pressure on its own. obviously forced induction is the more efficient way.
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