If your looking for horse power then the 951 is the right car for you. It is so easy to get power from these cars. A simple chip change. Can bump the power to 250 hp and 300 ft/lb tq. If you want your car to be fast then  I reccomend a Huntley Racing Stage 3 Mass Air Flow Sensor. It costs $1600 and will take your car from it's quick lil stock form to a brutal monster. The turbo will spool up much sooner, you will be able to here turbo spool up due to the fact that there is nolonger any restrictions in the intake system.