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Hi, Mike,
There are four O2 sensors on the goat.
There is a front and rear (after the cat) on each mid pipe. If you keep the cats, then no tune is necessary.
If you remove the cats, then the rear O2s must be turned off, or you will get an CEL.
I found a GM DVD repair manual on eBay for about $50. You can also search, as there a some Holden repair manuals around.
Larry
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