. wrote:what are the best value performance modifications for a car?
Nitrous, but it'll eat your car from the inside out.
Work on the intake first. K&N filter, turbo if you can afford it, intake manifold etc. That car seems to have an issue with the intake cracking with too much horsepower, so be careful. A modest chip improvement can be a help.
Then fork out the money for the exhaust system. You'll have to seriously increase your horsepower before tackling the exhaust. A bigger exhaust system than you need is the fastest way to slow down your car.
At this point you've probably driven the crankshaft out of the car in a big fireball. Put in bracing for the new forged crank and performance pistons. Add in a few dollars for oversized valves and a new cam. Smoothing intake flow and polishing the chambers helps a very little bit, but sometimes just makes it slower. If your mechanic tells you to try that first, find another mechanic.
Tuning the car comes almost last. High powered ignition and a better chip that makes the most of the cars new potential.
Last but not least. You notice that crease down the side of your car? That's the car twisting and buckling the sheet metal. It's time to think about how to keep the tyres on the pavement. Brace the engine against torque, put in a big sway bar, cross brace under the hood and put on nice new fat tyres.
Following this will let you make the most of the car while not breaking something you wouldn't have replaced eventually anyway. It''ll also give you the best chance of making a few quid.