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I just got done yesterday changing my stock 3.55 gear to a 4.30, myself, and it was definitely worth the hard work. The change itself wasnt too hard but I would definitely not suggest doing yourself unless you have the special tools needed. I would strongly recommend that if you do do it yourself, to drop the whole rear end out of the car. It makes it so much easier if you dont have a lift..... to tighten the pinion preload and shim the carrier. All total it took about two full nights after work to complete. I plan on posting a how to on how to change it yourself. I plan on track testing her tonight since if have two race, tonight night and sat. night. I cant believe the lack of parts for this car currently!!! I accidently install one of the brake pads backwards and scored the rotor, which is ONLY availible through Ford.:madas:. Shiming the carrier was by far the hardest part, maybe not hard, but time consuming. As for noise, under acceleration (drive) it has no noise, while in coast it has a slight whine but I think it may be b/c of such a large step in gear sizes. ie 3.55-4.30. The change really didnt hurt the top end that much either. At 70 mph in 5 gear its running at 2800rpm which is about a 1000 rpm higher. All in all I am happy with! Would I do it again.....? Probally now that ive done it before. Well if anyone has any question feel free to let me know. Also, a special thanks to my local Ford dealership, for loaning me their only copy of the "05 Mustang Bible" (-Ford dealer service manual), during the change :clap