I am new to this so please don't tell at me :O.
I'm thinking about upgrading the turbo on my 1.8. I was first thinking of buying a Ko4 turbo from eBay and putting that in but somone said on a diffrent fourm (Not Audi-sport.net) that I would need to upgrade a few things, sorry for not making this easy...
But the same guy said if I buy a Ko3s and replace it with my Ko3 my car would kick out 220 bhp.
It's an Audi A3 1.8T 20 valve.