I've noticed just now, that theres a few XTX air boxes on ebay (UK) going for silly money, �40 ish.

Now, with the help of a dremel, filters and whatever else needed, could there be a possibility for a DIY Stage 3?

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09 XT660X:

CCC Stainless Rounds, Stage 1 DNA, Stage 2 DNA, PCV With Custom Autotune Map, PCV AutoTune, Home made O2 eliminator, Self machined Fork Spacers, DIY Autotune Switch.