im surprised as I have experienced the reverse (as my RR results show). I wonder if the new smaller filter is too small? it does have half the surface area of my old one (the £44 kit one as in post 1).
It could also just be that the tables in your ECU's are still adjusting though as that will cause and effect.
It could also just be that the tables in your ECU's are still adjusting though as that will cause and effect.