Porsche 911 GT3 (991)
Why 5.3: The first GT3 without a Mezger engine and without a manual: a 3.8-litre 9A1-based flat-six to 9,000 rpm, PDK only, rear-axle steering and the wider body of the Carrera 4. The 991.2 of 2017 brought a 4.0, 500 hp and the six-speed manual the customer backlash had demanded.
Layout
Natural habitat
Ride comfort
Sound
A 9,000 rpm redline on a 3.8 — later a 4.0 — flat-six with an exhaust tuned like the Cup car's, and the climb from 6,000 upward is the whole reason to own one. It sits just under the 997 Mezger because the 9A1-based GT engine is less metallic mid-range, and under the 992 because that car got individual throttle bodies.
6-cylinder · naturally aspirated · 9,000 rpm redline · rated 8.8 / 10 for engine sound
Market value
Median asking price, good condition · €120k (2014) → €138k (2026), trending up · illustrative data
Child seats · ISOFIX
There aren't any — strict two-seater.
The only position there is, so makers of this era equip it: expect a passenger-airbag cut-off (key switch or occupant sensing) as standard, because there is no rear row to point children to. Whether the seat itself carries ISOFIX anchors is maker-specific — Porsche bundles them with its child-seat preparation, Ferrari sold them as an option, others are belt-mount only with the airbag off.
Derived from production years and seating layout, not a per-car source. ISOFIX was standardised as ISO 13216 in 1997, required on new EU model types from 2011 and on all new EU cars from 2014.
The long version
The 991.1 GT3 launched into controversy twice: first because Porsche dropped the manual gearbox and the Mezger engine in the same car, then because early engines caught fire and every 991.1 GT3 built was recalled for a new unit. Porsche handled both well enough that the car's reputation survived, and the 991.2 — manual available, 4.0 litres, no fires — became the GT3 that quietened the argument. Ownership follows the two halves. The 991.1 is the cheapest way into a 9,000 rpm GT3 and is driven and tracked like one; the 991.2 manuals were allocated, flipped and then settled into collector hands at a premium that has never quite gone away. Averaged across the generation, the picture is a car that still sees the paddock in numbers, carries real mileage on PDK examples, and has lost the lower part of its depreciation curve to the manual-gearbox market. The 992 GT3 pushed the 991.2 Touring and manual cars further up, and the 991.1 further into use.