I like to look at upgrades like the 2 pc. rotor thing this way: If the difference in cost could delay me in finishing the project and getting it back on the road, or buying another critical part, then it's not worth it. For some project budgets (or lack thereof), the cost of the upgrade won't make or break anything, so go for it.
If it had more of a functional impact, it might be a different story.
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Jeff: Project "Rolling Mockup" 69 Camaro SS, AFX, TKO600, Baer GT, etc
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