custom engines

I have a car with a 4cylinder engine and i would love to put in something with a little bit more power into it but the avalable engines are 4 cylinder, 2 liter engines. Is there someone out there that can biuld custom engines for cars that weren't originaly designed to go more than 5mph?

We would need to know the make, model and year of car first, to advise you better.

How much more power would you like? 20%? 30%?

Generally, (but not always) it is easier to mod the engine you have, if a modest power increase is desired.

Otherwise, you can swap in a more powerful engine into most cars, but the specific details vary from one car to another and depend on your spending budget.