Originally Posted by windrunner408
Either one will do the job. I dont think one is really any better than the other. IMO the AD1 is the one I would go with so in the event it takes a dump you still have the stock one to get you home. I have also heard of fewer failure rates with the AD1 than with the AD2 and the AD1 will support just about any injector you want to run unless you go with some huge hybrid or something. JMO.
Yes as mentioned above the AD1 is a high volume low pressure lift pump to feed the stock pump.
I have also heard that there are fewer failures with the AD1 than the AD2, FWIW. I also agree that I would rather have a lift pump, in case one goes out, you aren't left on the side of the road and probably having to replace injectors. That's the same kind of setup I have now, except with the dreaded FASS pump lol, so far no issues at all.