My vrs is running all the usual performance mods like fmic, zorst, intake, revo stage 2 & many more. Im wondering is it worth uprating the fuel rail and getting a adjustable fpr. Im getting a bit of hesitation on acceleration and thought it possibly a fuel issue as I've checked everything else and its had new plugs and packs about a month ago.

wont do anything apart from run lean unless it was mapped to take it into account ad even then there will be no power gains

change of filter would be a start

I'll order a filter from tps, cheers.