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on the engine
Turbo position is on the right front next to the p/steering pump if your A4 is a turbo unit if not it mite be a A4 L only no turbo specification. You can not install turbo because the piston are different from the turbo engine.
Under the hood on the back wall behind the cylinder block
I believe on this model you need a special tool to push the piston back. You can go to the website I have below click the link below!
Each cylinder has 5 valves. Three intake valves and two exhaust.
The 2002 Audi A4 has an inline 4 engine.
The 2004 Audi A4 has an inline 4 engine.
The 2009 Audi A4 has an inline 4 engine.
The 2010 Audi A4 has an inline 4 engine.
The 2008 Audi A4 has an inline 4 engine.
The 2014 Audi A4 has an inline 4 engine.
The 2005 Audi A4 has an inline 4 engine.