his is a kit that included all of the hardware needed to install a new catalytic converter / downpipe assembly on your A4. This kit includes the following hardware:
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6x Exhaust Manifold Studs (From exhaust manifold to catalytic converter / downpipe)
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6x Exhaust Manifold Nuts (Secures catalytic converter / downpipe to exhaust manifold)
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2x Exhaust Manifold / Downpipe Gaskets (Between exhaust manifold and catalytic converter / downpipe)