If you live in Britain, then no. Although you could fit a Bantam D1 engine into it, which has a capacity of 125cc, that would be learner legal.
Install a v10 viper engine in the boot, would be a sweet project but expensive! try upgrading the exhaust system, a straight through from the cat would help airflow, you could also consider getting a de-cat pipe. this would probably see an increase of 4-7bhp depending on the model, be carefull though as removing the cat will make you car illegal! taking out the back seats will see you off the line a bit quicker, although this is the only single advantage of doing this. after that you should probably sort sum new stiffer springs/or a whole new suspension kit. some wider wheels will see you stick to the road round the corners better. then maybe some uprated cams, an engine remap, bigger brakes. hope you have some cash!!!!