On the note of that 911:
I've seen a few of these before. Personally, I would never do that, and I think it's stupid and maybe even a little traitorous to the brand.
But.
I see the appeal. It is
stupidly expensive to add power in a older (pre-996) 911, especially keeping whatever motor your car came with stock. That car looks like a Carrera Targa, which would mean it has the 3.2, which means that the easy power comes from backdating the exhaust to SSIs (or equivalent). That will pick you up 10-15 hp, but (especially since they don't make real SSIs anymore) even that is easily >$1200 to buy the new headers and a new muffler that will fit them.
After that, you're looking at ditching the CIS and going to PMOs or Webbers, which is a bigger power gain (20-30), but is another $2500+ prospect, and means you now have a carb car instead of a nice fuel-injected car.
After that, the next step is going to a different, more-aggressive cam profile. This is another decent power gain (15-20), but is (especially if you don't do the work yourself) easily another $1200+.
So, after all that, at least $5K into it, you've picked up maybe 50bhp, which means you now make a thundering ~260bhp (on a US car, gains would be less on a less-regulated Euro car) in your car. The smarter option some would say is to simply swap a 3.6 varioram in and be done with it. That's an easy ~290bhp right? Yes, it is, but it's also an easy $10K, at least. Plus the same cost for backdating the exhaust (which you almost have to do to make it fit).
Taking the V8 route is a similar cost to the 3.6 swap, and is not only more power, but is actually lighter and much cheaper to add even MORE power to. So yes, I see the appeal.
It's still an abomination. But a semi-logical one at least