Audi 80 2.0e more power

Hello people I’ve got my Audi 80 2.0E B3 standing I wanted to ask if someone can tell me how to get more pressure under the bonnet I’ve already fitted a fan manifold The air filter is open the engine has quite power already : but I want more what can I do ???? and then I’ll have a second question my dad has ever got an Audi 80 convertible (B4) what do you get registered for a tire width ??? I’m grateful to you already a n times Every Raudi drives an Audi