It's definitely a faster and noticeable bump up in speed after the upgrade. Doesn't match P3D or stealth P (which it isn't expected to), but in my opinion it's worth it....that is definitely relative because no one 'needs' to go this fast and in daily driving you won't use it. But for those of us who never had a chance to order a stealth performance because they didn't exist, and don't want to take a 20k+ bath trading in an AWD for a stealth, this is a good upgrade to have.
There is a very long thread on the main model 3 page and I've posted some of my results there (but also amongst the 70-ish pages in 5 days for that thread there is a lot of side bar discussion....). So, here's my personal thoughts:
Worth it? Yes
How fast? 0-100 improves to ~3.8s without 1 foot rollout, and about 3.5-3.6s when including it.
Relative to full P3/stealth? This gets halfway there, but P3 would be yet another level of crazy.
Personally, I think this upgrade isn't going to be the end of the speed boosts and perhaps more increase coming down the road to purchasers. Pure speculation, but the presedent would be if you have FSD there are features you keep getting improvements on that people who didn't purchase FSD don't get.
Edit: link to a post in the other thread with a decent vid comparison....there are a few of these out there now but this is a good one. Also in the thread linked people are posting their own drag times and a lot of people are seeing close to 3.5s with 1 foot rollout 0-60 mph.
MASTER THREAD: "Acceleration Boost" option, discussion as to which models and how much quicker
Post with some drag times:
MASTER THREAD: "Acceleration Boost" option, discussion as to which models and how much quicker