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I'd agree with you... the best comparison I can think of is my old Mclaren 650S I ran at a Wanna Go Fast event here in Texas. It ran 159mph bone stock and made 650hp. I installed catted downpipes, and a 93 pump gas tune and re-ran the car the next event, in similar weather and it ran 166mph.
So, to think in terms of added hp for additional speed I'd say you're pretty accurate in your statement. I've also always heard to run 180mph you need a minimum of 1k hp too.
I do think these cars will go mid 160's with a tune on E40-E50... I really don't even think you need exhaust mods, or downpipes.
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