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Quick video on my BMW E61 exhaust upgrade..this wasn't dine to gain the extra 10hp but just for the cosmetic look. in this video we have changed the flexi pipe this is known to break over time, DPF was blocked so we had to gut this out and whisky we were doing this we thought of adding the quad exhaust on it. no extra noise or anything just for the looks.
we have also discovered the turbo had oil inside it which was letting the oil out through the exhaust system which lead to heavy smoke. this has been also changed with used working one and new seals from BMW.