Is that the filter used on the mr420?
If so yes I am.
It's bigger. The difference in performance I can't comment on as I changed other things at the same time, but I'd say it is marginal. Bit more noise vs 57s I had before but then the turbo was replaced too.
I'd make that trip to Essex and get the 420 done then you'll see a whole heap of difference all round :smile: