How much money for more horsepower
 

How much money would it take to make a stock MKIV over 600 horsepower? I just want to know if there is an estimated amount to judge. I know the stock MKIV comes with about 320 hp. And what parts would basically be included in this upgrade?

could always get a bigger turbo... but with more air you need more fuel, and it would probably want to get better pistons and rods... i think that would be the cheap way of going about it... but i dont know anything, you shouldnt listen to me

Might help
 

By changing one thing you will have to chang other things to compensate , like yeng and yang, good and bad, theres 2 sides so to speek, : eg; if you put bigger exhaust on you will need better inlet hardware, like bigger and better filter+throttelbody and pipping, turbo, injectors, aftermarket ECU to realy make it better, bear in mind bigger intake pips = more lagg not much but a little so length is best kept short, from turbo to inlet-valves,