if you want to do some work search the forums and look up

House of Power
TVT designs
Let tune
Inmotion
Eurocharged

i am sure with enough money around 3k-7k you can get what you want in terms of power and can range from 300hp-450hp. it might take an engine swap to get you to about 450hp but i can see you doing that using a forged motor with a rear tubo setup. the fabrication and parts is not an issue it is the ECU and i think House of Power has the knowledge to do it since they have done it on other cars that are Mercedes.

http://www.hopracing.com/

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