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So I have got some cheap hella horns and my 05 impreza has only got one wire for the horn, I know I need a positive and negative wire to split from the existing wire but was wondering if the link below is going to do the job?

1 to 2 Adapter Wiring set 1 to 2 Converter Wiring Car Horn One-to-Two Converter | eBay
Increase the sound output of your vehicles horn with this 1 to 2 Horn Adapter Wiring. Crafted with materials, this 1 to 2 Horn Adapter Wiring ensures performances and longevity, making it essential accessory for any owner.
www.ebay.com.au