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I love my 930 brakes, but they don't necessarily stop a Carrera any faster than the stock brakes do. The larger rotors do provide better heat dissipation (avoiding brake fade over time) and I do like the "pedal feel" of the larger master cylinder and calipers, etc.
If you randomly grabbed a regular Carrera and a Turbo-look and put both on a track, it's likely that other mods the owners have done would make a bigger difference in how they performed. A widened track and bigger brakes are both pretty minor changes, in the bigger picture.
But the brakes on the Turbo-look will resist fade better. And the wider track will make a slight difference in cornering performance. The nice thing about the widebody is that with a little work you can run much wider wheels and tires, which will make a difference in lap times. Steering the TL will require more effort, and it will be a little less well-behaved under hard braking on uneven surfaces. (But again, those differences aren't dramatic.)
On the street, the big differences are the look of the two cars -- which is subjective. Also notable is the way the value of the factory Turbo looks have held on. They've essentially become collectibles.
For a dramatic change, find a Turbo-look with a Turbo motor in it. Porsche called it the 930.
I've driven both stock cars, I couldn't tell the difference in acceleration but I did feel the WB sat flatter around corners but was a little 'duller' on turn in, didn't seem as flickable. The brakes were a huge improvement though. For me it came down to condition of the car and I personally liked the look and rareness of the WB. I think either car will put a smile on your face.
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