It’s hard to believe, but Porsche has been producing the GT3 for a quarter of a century. And across four different generations of the 911 — 996, 997, 991, and 992 — the GT3’s philosophy has remained the same ever since it debuted in 1999: reduce weight, feature a high-revving, motorsport-derived naturally aspirated engine, optimize the suspension for the track, and beef up the brakes and running gear for repeated abuse.

The first generation of GT3 almost didn’t happen, too—Porsche was still under considerable financial stress in the late ’90s and was pouring money into the development of the new 911 and Boxster. Adding the cost of developing a high-performance road car was an enormous risk for the company, but Porsche motorsport executive Hartmut Kristen was able to convince the board to take a chance. Not unlike the story of the 1973 Carrera RS, no one expected the car to sell well, but the 996 GT3 happened to be such a success that Porsche had the confidence to invest in future developments of the GT3. Thanks, Hartmut!

The GT3’s philosophy may have been retained through each generation, but there are notable differences between them. Aside from getting bigger and fatter over time like all other modern cars, there have been major mechanical and technological advances that are worth investigating. As such, let’s take a journey in time using recent GT3 sales to see what’s what.