How do you get so much HP

How do you guys get soo much horsepower on your cars. I can only get like 900 on most of mine, and here I hear bout 2000 hp cars that do 400 mph, how the heck do you do that stuff?
 
Never used them. Though i've been wanting to for a few reasons... like throwing an Integra R motor in the CRX so I can turbo it ;) Which i'm not sure is possible:odd: But it would be sweet :D

-Ben
 
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