^^Sounds like you've found your "dream" car. Now, about your "reality" car ...
What if you sold off some of your current mods - you'd have a nice down payment on a turbo. Good turbo setup would cost about $4,000, including gauges and tuning (and you HAVE to get tuned.) Still wouldn't handle like an M5 but you'd be fast ..

 

Still wouldn't be as fast as an m5, either. If I were you, I'd save and invest my money, get a good job, and buy an m5 (or whatever) when I could afford it. Then you can smoke all us punks in scions all day long. They'll say "at least I didn't spend $80,000 on my car!". Let 'em say that all day long because you can say "at least my car isn't SLOW."

 

well my car is for sale, been for sale for about 3 weeks now, im getting a 2005 545i saving more money, maybe jut maybe in 6 years i can get it, lol i know a long shot, but the 545i is fast too