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               Originally Posted by 
              Gas_Up_Lets_Go  
              I always thought the X/R O2 eliminators were different to the Z. 
              
 Doesn't the Z use some weird logarithmic (is that the right spelling?) system, and that's why they've take so long to get to market.
 
 Kev ??
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         I might have got it wrong or Simon might have told me wrong, he said all xt 660's