honestly around 400awhp is a great number for streetable. I know my stealth twin turbo awd/aws pulled like freight train @ 425awhp on dual 13g's.
And my 1991 Dodge Colt 4g64 20g @ 400fwhp was a monster. But it wasn't to the point where it would break axles as often and I never blew out the manual mitsubishi transmission. (but i sure did blow up the 6spd getrag in the stealth) around 400hp is a healthy number for mitsu's to handle for a daily driver.