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| 05-10-2015, 10:23 PM | #1 |
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Catalytic system clean (DIY video)
https://youtu.be/bV3USW19GB4 Download from net.(Not BMW Motor) It is a little hard for my z4 to cross 1800 RPM in city driving. It was always keeping gasping in 1800 RPM for a time before it went to 2100 RPM and then engine and exhaust noise will sounds better. I bought a catalytic system cleaner tool(10 £) . After that all things has improved significantly 
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