tools, time, and money
Hey Seabass, I think that you're a bit overstating it: "If you can't work on your own car you should own nothing but a stock car. ....Pullies aren't hard to do...just do it. Much more satisfaction to be able to do things yourself on your car....gives you that feeling of accomplishment and maybe even a slight understanding of your car. "
To the first point, it's mostly true. "If you can't work on your own car" presumes a lot: one, do you have the skill to do the job; two, even if you have the skill, do you have the prpoer tools; three, even if you have the skill and the tools, do have a place to do the job safely; fourth, even if you have, the skill, the tool, the shed, do you have time? Answer all four yes, then by all means do the job and get that satisfaction of knowing that you turned the wrenches that built the thing.
To the second point, "...you should own nothing but a stock car" is too much of a knee-jerk reaction if you don't the reason why the first clause (if you can't work) applies.
And lastly, I think it is a bit foolish to undertake any job if you don't begin with "even a slight understanding of your car"; i.e. that means you don't have the skills. To me, if you don't understand the mechanism your about to fix or upgrade, you have no business taking the damn thing apart in order to "figure out" what it does and why. Let's take the "PI" heads for example. Most people on this list have a good feeling that it's certainly an upgrade from the stock heads. I also would wager, that many people on this list have never seen a head removed any car, let alone personally performed the task to take one off. To those unitiated shade tree mechanics, should they forgo this upgrade until such time that they possess the personal skill to do it, or the proper tools and place to do it?
Although swapping the pulleys is a DIY "doable", if you're not properly equipped or just plain uncomfortable doing it without some coaching, then don't be lame-brained and matters worse by doing it yourself...get some help. And if you dont have a buddy who has the time to show you for repayment of a couple of cold brews, then hire someone with the skills. Or perhaps you're in a situation like I had where time was (and still is) precious, and since I already have extracted plenty of DIY satisfaction just needed to get the job done quickly and properly.