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I bought a 2002 audi s4 2.7 Bi-turbo.I am looking into upgrading the power of of the car.I was looking around and found a company called APR.Has anyone ever used their products?Their stage III looks great to me.But I want to do my own exhaust.I have many years with making exhaust systems.Let me know of any problems I might run into.Thanks yall.
 
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