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    V6 TDi - More or Less Back Pressure? Whats best?

    Howdy all, opinions please... I have a 2.5 TDi Quattro, and have recently changed the exhaust system. I now have 2.5" stainless steel pipe, from the downpipe to the rear box, no cats, no middle box / silencer etc. Just straight stainless pipe to the back box. For a month I ran it with the...