G'day guys I've recently bought a JDM evo 8 with just over 200k kms on the clock and just wanting to freshen up a few parts. I'm going to get a filter assembly and while I'm at it I figure I might as well replace the pump. The car is mostly stock as far as I'm aware and I don't want to get it tuned so I'm looking for an equivalent oem pump replacement but cant seem to find any. Walbro 255 are at a good price but just wondering if the stock fuel pressure regulator would return enough flow back to the tank or am I likely to run into rich fuel mixture issues on a stock tune

 

255 will work. Install a wideband gauge so you know your afrs as well.