What are you looking for? Big horsepower? Driveability? Fuel economy? Price?
A 1.8 8v in your car is a real easy upgrade and cheap. Next up would be a 2 litre block with worked 8v head - good for an easy 130+ hp. I've got a 2 litre 16v motor that's good for 140hp sitting in my mate's shed. It's going into my MK2.
If you're after serious horsepower an ABF motor comes standard with 150hp and goes to 200hp with a bit of money spent on it, all naturally asperated. Spend a lot of money and you'll get 300hp out of it but by then it's going to be a cranky b**ch.
At least $4500 is needed to go down the turbo 20v route and you start with 200hp. There's a couple of guys in Germany getting over 1100hp out of their engines but I hate to think how much it cost them.
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