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I have it but I am not sure about taking the turbo off with it on. I like all the room I can get when taking the turbo out. So the HPX is easy to take off if needed so I would do that if needed.
i installed mine a couple weeks ago. the return line rests right on the side of the compressor housing, touches it for several inches. very tight fit at the JIC. route the line to get the most direct run at the return hole. there isn't a mm of slack to play with. be careful not to cross thread JICS and connectors. make sure you can tighten down several turns with just finger pressure before you wrench. take the "engine cover" bracket off of the HPOP to give you better acces to the passenger side fittings. loosening the fuel bowl bolts didn't really buy me anything b/c the fuel supply line will still be in the way. it's just a tricky bitch, but #8 definitely likes it. an extra hand (vice bungee) while installing the new FPR block would be a huge help. don't goof the spring and poppet or you'll end up doing it over. triple check for leaks.