MY05+ have the 2.5L and I believe that's when they went to a taller final drive gear or something along those lines. It put more stress on the gears. Again, more info on that is available on the Unabomber's Tranny FAQ.
The way I understand it is that the gears are weakened with every shock load. I used to think there was a build consistency issue and that's why some people with bigger turbo would have no issues while many stage II or lesser cars would bust gears early and often. I'm slowly starting to move to the "drive it nice, and it won't break" camp. Every shockload takes you one step closer to breakage. It might take several large shockloads without breaking, but then one day you shift into 2nd smoothly and blam-o, straw-camel-back.
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Slow and low, that is the tempo.
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