I have just ordered one of these from Ebay...my standard horn is a bit pathetic, and I hope this will be a bit louder.

http://www.youtube.com/watch?v=w_vqyi_owAI

It looks like a simple fit on the "R", in fact I think it may just be a straight swap-over, and for the price I think it is worth giving it a go.

Will I need better/upgraded wiring for this due to the higher output?

http://cgi.ebay.co.uk/STEBEL-MAGNUM-...item4aa7b58843

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2008 XTR Mods : DNA Stage 3 Airbox, PC111, Carbon Cans Ovals, Steve Ruth built XTR734cc Big Bore with - High Desert Dyno (HDD)/ Cuervo Racing Gas Flowed / Ported Head fitted with +1mm Valves & uprated Springs, HDD 5050 Camshaft, HDD +3mm Throttle Body, CP 105.5mm 11:1 Piston, Custom Mapping, Piasini ECU, Renthal 613-01, Barkbusters VPS, Pivot Pegz, Touratech Bashplate, Foam Grips, Kev's O2 Sensor Mod, Kev's Extra Coolant Cooler, Wilbers Progressive Fork Springs and Rear Shock