According to the timing sheets for the Nürburgring 24-Hour race, the now-hybridized P4/5 Competizione set a lap time of 6:51 during qualifying. That would make it faster than the "Production-Derived Sports Car" record of 6:58.16 set by the Ferrari 599XX in 2010, and the fastest Ferrari-powered vehicle to ever run the 'Ring.
In case you don't remember, the 700-horsepower 599XX was also a purpose-built, track-only racer driven by a test driver. On the other hand, we don't have specs on the P4/5 Competizione to compare, but that doesn't make the achievement itself any less impressive. The only car ahead of the P4/5 Competizione in the not-street-legal category is the Pagani Zonda R, which rocked a 6:47.50. Glickenhaus himself told Jalopnik he thought the feat was "pretty cool" and that Ferrari was welcome to challenge it.