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It only costs maybe 12k to put together something that can go 180-200. Early 2000 f-body with nitrous alone will get you to 160.

Sure the average person hasn't gone that fast but if you want to it's not that big of a deal

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Basic bolt ons for a gm F-body will take you up to 155 mph before being electronically limited. Don't need nitrous for that. Pretty sure though beyond 180 would be incredibly hard.. That is a ton of aero force the cars weren't designed for, not to mention tires.

If you really needed to go over 180 mph in a GM car, you'd use a Corvette. Used ones are surprisingly cheap and I'd venture to guess that all you would need to break 180mph in a C5 (OOB they do 175mph) would be a taller top gear and some engine electronics, although there are obviously lots of engine modifications available. For a little more than the 12k the parent post mentioned (I'm thinking 15k), you could have an expert bore the engine out and get an extra 130hp. For less than 40k you could be driving a real monster.

These sorts of mods are common enough among drag racers, except most of them aren't optimizing for top speed.

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