Going back through the data from our AEM CD5 using the AEMData software, we noted that our boost was rising faster with the Vektor Performance header. The quicker boost response was reducing the time to torque from 2.2 seconds to 1.6 seconds, a 30% reduction! A pretty impressive amount and one that does not correlate exactly with dyno charts.
We were quite impressed how one single part could really change the character of a car. The Vektor Performance headers make the car seem much more responsive and willing to rev. They were not any negative attributes to the headers at all. There was a very slight gain in exhaust noise that was hardly noticeable and actually pleasant, more musical sounding.
Strangely we did notice an increase in intake noise, it sounded like the turbos were sucking harder. Since the turbos were spooling sooner, the intake noise was a pleasant sounding by-product of this. The intake noise was somewhat reminiscent of the GT3 RS and its very open ram air system, but not quite that loud.
We would consider the Vektor Performance headers a must have in tuning the 991.2 turbo, Carreras. We have heard that with some bolt on parts and minor tuning that the Carrera can easily match the power output of the vaulted turbo models with reliability for a fraction of the price. We would love to see how these headers enhance these cars performance with a good exhaust system and a Cobb Access port!