[Bovril]

BMW 3 X1 X5 Series E53 E84 E90 E91 E92 E93 Low Tone Pitch Horn Signal 7159421 | eBay

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This is what I fitted. Straight swap, tank bolts loosened but not removed and some skinned knuckles but done in about 15 minutes and massively louder. The plug is the same so no splicing or changing of connectors.