I remember talking to a tech from Sportec in Switzerland. They had a Carrera GT there for tuning. The owner wanted more power and theoretically, it wouldn't be a problem. But Sportec advised against it, especially using turbo chargers because of the ceramic composite clutch for example but other reasons too. So they just fine-tuned this car, a few horses more the classic way, the suspension stayed the same ("there is nothing to improve..."
).
Personally, I think most CGT owners should learn how to tame the current HP they have on the original car before they're thinking about a 25% power increase. Ouch.
And Tuners who do EVERYTHING for money, aren't serious in my opinion. There has to be a limit, a technical one and a moral one. You can add a 1000 horses to a car but what then? I mean look how many problems VW had with the Bugatti Veyron during development. And they invested hundreds of millions in this project. Now imagine a Tuner with a testing/development budget of a couple of tens of thousands of dollars...IF that much...
I would never "touch" a Ferrari Enzo or a Carrera GT, this is a sacrilege, the most dumb thing people can do. They not only destroy the original setup, they spit on the passionate and intelligent work of some of the finest development engineers worldwide.
I don't get it: people are intelligent enough to earn a lot of money to be able to buy such a fine car like a Carrera GT and then they're dumb enough to throw away another tens or even hundreds of thousands for destroying the work or art. This is like buying the Mona Lisa and changing her hair to blonde, making her lips red and adding some sun glasses to it, not to speak about a boob job.
Sorry for my angry words but some things, I really don't understand.