331,000 miles on my stock injectors, no problems so far. I do change the fuel filter (always fleetguard), every oil change. I also run Valvoline injector cleaner about every 10k.... also, No problems with my 6-speed manual transmission either. I have replaced 3 clutches. In fact the only thing I have replaced, on this motor is one water pump and several lift pumps. I ran a pressure box, called "the volumizer" for about 100k, then ran "the smarty" for about 120 k. I have been running it at stock for the past 110k or so. Got tired of replacing clutches and lift pumps. At times I miss the extra HP, but in reality, it has plenty stock.