I'm pretty good with cars.
A note on supercharging vs Turbo'ing.
Turboing is alot cheaper and also cheaper to maintain, but does not give as much power as a Supercharger, also a supercharger is always running. Whereas a Turbo only kicks in a certain RPM, this is also known as Turbo Lag.
It's also wise to get an Intercooler with Turbo's otherwise you will likely fry your engine.
To make you're care go faster you can...
- Add extractors to your motor.
- Add larger exhaust (usually 2.5" for 6 cyl and 3" for 8 cyl cars)
Doing the above makes it easier for the exhaust fumes to exit your motor, given you faster and more effecient compression.
- Cold Air intake
- Turbo
- Supercharger
The above force more air into your motor, thus giving you a better combustion which equals more power. (cold air intake does not force air in at a faster rate like turbo's and super chargers, it cools the air therefore you get denser air which contains more oxygen. This is nowhere near as good as a turbo but does increase performance.
- Increase fuel intake
Depending on how old your car is you will either need to adjust your carby, or chip your car (fuel inj) Probably not the wisest idea with the prices of fuel skyrocketing.
You can also go nuts and do things like boring out your cyclinders, getting better crankshafts and lighter flywheels etc.
And if you're into serious racing, bodykits and rear wings create downforce to help your stability while going around corners fast.
Wider profile tyres will also give you more grip which will lead to faster acceleration.
EDIT:
I highly suggest getting extractors and exhaust before Supercharging your car, as it will still be fairly limits by the stock extractors.