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I don't want to turn to meth injection, mainly because then it is no longer a true street car. I think 500 is obtainable, it's just going to take ALOT of work, the right parts and an awesome tune. I am just trying to figure out what engine management system to go with.
Now that is my goal, so I also accept the fact that I may not reach it. So I'm just going to take it as it comes.
I have a Volvo for my daily driver, but my mirage is not going to be strictly a track car. I find that takes the fun out of it.
If you wanna hit 500whp on pump gas you're gonna need a huge turbo that's very efficient at high boost levels.  You're gonna need to run a ton of boost, and the only way to do that on pump gas is to run VERY little timing advance.  Most guys run like 2* of advance, maybe less.  500whp on pump has been done before, it's definitely not a BS goal, it's just not gonna be easy.  Dre99GSX did like 503whp on a AGP 50 trim, which is pretty incredible really, especially considering it was a few years ago.