The VR6 motor is a narrow angle motor and is not the same as the Audi V6. Why not go with the supercharger? By the time you buy the turbo kit ($3100) and then do all the exhaust work another $1000 easy, you are close to the $4895 supercharger and that would have none of the headaches of homemade turbo conversion.
That or sell the A4 car and buy an S4. Which would be my choice. Sell yours for $8000 and put the $5000 back into the S4 purchase. I know you can find S4's for $13,000.
VB
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