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If it aint broke don't fix it. If you're having problems or performance issues then worry about it. It is a very good idea to replace the WP and opti at the same time because you have all the stuff off already. You do need a few tools like a 3 finger puller and hub puller and getting the new seals in right can be a pain, so doing both at once is just a good idea.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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). But like Jon said, no reason to replace it before you start to notice problems.
