Hey guys its time to upgrade my fuel system as it doesn't like my xstreet tune. Fuel pressure will drop to around 48psi on wot pulls. I got a tsd sump and was looking to do an airdog . I like the ad 2 a lot because of the regulator however I have heard of a few having problems and without the hfcm ur sol. So my question is what exactly has been failing on them? Is it as simple as having an extra motor and some o rings in the toolbox?