I hadn't thought about cost. I just had a look and Triumph want US$64 for the filter !!!!

Part 10 here on Lings Triumph parts locator.

That will be over AU$100 once the dealers here put their 300% markup on it. We must find a replacement option.

Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge