This video has been out a while. I think I've had it for at least a year.
I would wholly expect an S4 with those mods to do that to a stock STi. The stock STi(US Version) has 300HP. A stock S4 has 250HP. This one is modded and has turbos from an RS4. The RS4 made 380HP stock and it's not uncommon for tuned cars running those turbos to make 400-450WHP. So, assuming 400WHP or so compared to the STi with more like 250WHP or less, I'm not surprised at all.
Not to mention that the S4 is not a light car by any means. It's giving up around 600lbs to the Subaru so even if they were both making the same power, the STi would likely pull away so the S4 has got to make more power just to stay even. It's not the same difference as you'd see if it were a 300HP Sti vs. a 400WHP STi. As much as I like the STi, I'd still rather have an S4. It's still plenty quick enough for me and a lot more comfortable than any STi.
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