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		If you can afford an aftermarket one now, I would save just a little longer and get a genuine unit. It seems the cheap aftermarket ones are a bit hit and miss.
I haven't tried an aftermarket job and wont be either, simply because of the reports on them being substandard. 
Check out some of the UK performance guys like Alive Tuning, BAS etc and see what they can do for you for genuine one also.
	 
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		the aftermarket ones are around $50 on ebay, yet the others are in excess of 150 lol :( my disco is road tripping to melbourne next weekend to pick up a friends new horse float. i might jsut clean it for now and then wait until can afford a genuine one
	 
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		That's good idea.
It certainly won't be any worse than it already is.