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I did mine with the spider on but Barry's right, does make it easier. Just a tip, when you unscrew the plugs, have your HPX bolts ready to go in, then your line, oil seeps out slowly then you have't to deal with oily hands. Snug tighten, don't overtighten..
Be warned -- I was paranoid about over-tightening, but ended up with them too lose. Had to replace the O-ring on one side as the 2500+ psi of oil shooting past it tore it up.
Hmm... Maybe I'll have a look see in the morning. Don't know how comfortable I am with taking the spider and whatnot off by myself.
Give me a call and I will walk you through it. It takes about 15 minutes to install and you really don't need to remove anything unless you really want.
Clay's right, you don't need to remove anything, but for me, it makes it easier to recover lost parts and tools, which reminds me, if you do pull the spider, cover the intake openings with a rag so stuff don't get it there. I've done it both ways, one for me and one for my buddy. We pulled his spider because he needed new boots anyway. It was a lot easier without it in the way.