So, I currently have 440cc injectors in my car with a tune, but I think they either need to be rebuilt/cleaned, or replaced, I'm having a lot of stumbling and stuttering upon cold start like it's running too rich. If I switch back to my OEM injectors and tune, it starts up fine, so I'm thinking it's probably my injectors which I've been running for a long time.

If I were to look at replacing them, which ones should I be looking at?

Thank you

 

Can't speak from long term ownership but just completed my tune with 440s and went Bosch - the pink ones. They came with connection adapters that I don't particularly like for the wiring but I know they're reliable. For something this important I don't trust generic eBay specials. Also have a wideband A/F gauge to keep an eye on things.