Well I’m 19 so anything over the 1.4 isn’t viable insurance wise and it already has a lot of stuff done so...
I'll sound like a grumpy old man but I'll try to give you some sensible advice.
Firstly, have you told your insurance company about the modifications you've done? If not, you don't have any insurance. Your insurance is conditional on the information you give them about your car being correct. So if you tell them you have a Fiesta when you actually have a Ferrari your car isn't actually insured as it's not the car they thought they were quoting you on.
Modifications are the same. Modifications don't have to increase the performance. Statistically, people who mod cars crash them more often than people who don't so their insurance costs more. It might seem clever to not tell them about the mods but they are the winners. They collect your money each year but have no risk of having to pay out as they can justifiably reject any claim you make. This is why they don't ask for pictures when you take out the insurance, they take your word for it. They don't care if you're lying at that point. Have a crash? Trust me,
then they'll inspect the car!
So if you've not told them about the mods, get on the phone and tell them. I could tell you a couple of stories about people who got caught lying to insurance companies. You don't want to go there.
If money is an issue you should bear in mind that modding cars almost always takes value off them. You can get lucky but most of the time modded cars are harder to sell and won't fetch the same money as a clean car of the same type. Mods are very personal, that's the whole point, and few people will have the same tastes as you. They also put the insurance up and flag the owner as someone who maybe drives the car hard. I bought a modded car once in my life and I'll never do it again.
The last thing is more practical. Increasing the power of your car often makes it less reliable. Years ago I was thinking about buying a Fiesta. I bought a Fast Ford magazine and on cover was 1.0L Ecoboost car that had been taken from something like 75bhp up to about 150. The article explained how the company had achieved this. Out of curiosity, and to find out a bit more about these cars in general, I called them. First thing the guy said to me was 'Yes, you can take the power up to 150hp on these cars but DON'T!". The car will drive like crap and you just break stuff. Nothing else about the car is designed for that power. The factory cars with more power have different brakes, different suspension, different gearboxes.
You'll know yourself, the 1.8 Leon has bigger brakes than the 1.4 but other differences can be invisible. For example BMW used four different qualities of piston on the same size of engine depending on the power output. Stronger parts cost more so manufacturers won't fit them to cars which don't need them. All of the parts of a car are carefully balanced to work together. If you up the power there is a good chance you'll reduce reliability and unbalance the car.
Sorry to be a downer but I just want to open your eyes to the possible consequences of modding cars. If you're fine with all that then cool. It's your car and you can do what you like with it. I'm an old fart now so wiser and less pinched financially but I remember my first car, a Mk2 Astra, and it had GTE bumpers on it before I sold it! So I totally get it. But would I do it again, knowing what I know now? Nope.
