Does anyone know of a replacement airfilter for the 175 dci?

yeh ITG is supposed to be the best, try this:

http://www.bhpplus.co.uk/product.php?productid=16730&cat=707&page=1&code=WB-308

cheapest around and members can get 10% off as well. Cheaper than K-tec. lol

Thanks carrmrc96,i've mailed them.