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I currently have a 2009 with a Litchfield stage 1 tune and so already has the Milltek Y pipe, can I add the Milltek secondary cat back exhaust without causing any issues? would I need a retune?

Its still a little bit to quite for me with just the Y pipe.
 

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Yes you can add that without issue, you only need a tune if removing down pipes or swapping out the cat back on a 2017+ as they have a valve.

I was the same I went stage 3 but only for few months then I went 4.25 with the downpipes purely for some drama.
 
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