We apologise for our lack of reply on the forum, which could make us come across as unprofessional, but we have been working hard on this behind the scenes. We will make sure this lack of communication doesn’t happen again. We agree that it seems to be a simple thing to get right, but the filter is the only part of the kit that Forge doesn’t make, and having used the BMC CDA filters before (which definitely DO fit in the ‘reverse’ orientation) we fitted our carbon canisters in the reverse orientation too. Our US office had not used BMC filters before and so fitted them in accordance with how you perceive the filter would be fitted if it weren’t boxed in i.e. with the wide end attached to the inlet pipework. It’s only in the last month that we’ve received the flow diagram from the filter manufacturers and acted upon it.
We’ve conducted many hours of testing on all of the cars that feature our twintakes, and have tried with the filters in both directions, and seen negligible difference in power or power delivery. Of course, the filtration remains unaffected by orientation. If any customer perceives that they have an issue then they should contact us at info@forgemotorsport.co.uk
We can only apologise for any misunderstanding that we may have caused.