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I went with the MFactory 2.81 pumpkin in my car, and I absolutely love it.
I'm running fbo mhd stg2+, and plan on going upgraded turbos with e85, stg3 fuel pump, PI, etc. and I KNEW that the stock 3.08 gearing was going to be a problem.
First gear was already useless, and I also disliked cruising on the highway at 80mph with the rpms riding around 3400+
When I did the LSD, I did get an ABS & DSC light for a little bit, but I think that had to do with my alignment (I had also done control arms & other subframe stuff) OR the car just had to re-learn some stuff,. I don't really know because the light went away on its own after a while, and I got my ABS & DSC back.
I will say, you should code-out the e-diff setting using coding software (I used Protool w/ a Thor adapter) now that you have an LSD, so the car doesn't try to brake one side of the axle (which was okay to do for open-diff)
I highly recommend taller gearing for higher power applications. (If you're mainly street driving.)
Even at fbo stg2+, 1st gear w/ the 2.81 is still too short and nearly non-useable for launching spiritedly, but it, and every gear after it is a lot better than before. I ONLY use 1st to take off and drive up the first 10mph or so, then I can book-it from 2nd gear & on. All the gears are much improved, and I feel like it should have come this way from factory.
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