VFE had two different supercharged cars for us to sample, a rather fast 3.6-liter Carrera 2 and an even faster 3.8-liter Carrera S. Both kits run at between 5 and 6 psi. The relatively low level of boost means the factory compression ratio is still utilized, so off-idle performance remains intact. The supercharged Carrera 2 really comes to life, the blower waking the low end up and making driving it easier than ever. The chassis is already extremely competent and from the factory the 3.6 feels almost underpowered. The extra boost doesn’t sound like much, but it’s definitely noticeable on the road.
The Carrera S, while fast from the factory, feels elevated to GT3-like acceleration. At low- and mid-range rpm it pulls like you’re in a gear lower than you actually are. At high rpm it pulls like you have two more cylinders. The linear power delivery is the most impressive part. There’s no big jump in the powerband so coming off corners is smooth and controlled. In turbo cars you sometimes feel like you’re lighting a fuse and waiting for it to blow all at once, while the supercharger gradually feed the power in.
Short of increasing displacement, we don’t know of another way to add this kind of seamless power to an already well-developed engine like the Porsche flat six. The VFE kits start around $10,000 for 996 models and about $12,000 for 997s. That may sound steep, but we’ve seen aftermarket exhausts that cost half as much deliver only a tenth the power. The only downside is that if the dealer sees one on your car, your warranty is in jeopardy. The kit is completely reversible though, so if you happen to pull the pin on your motor, everything can be taken off before it finds its way back to the service department.
Source: European Car Web