California’s SB 1069 lets experienced manufacturers seek conditional approval for tested aftermarket parts while CARB finishes its EO review. It does not legalize every modification.
Manthey’s Porsche 911 GT3 Cup MR 30 pairs a 552-hp, 4.2-liter flat-six with revised cooling, aerodynamics and suspension. Its companion Cayman MR 30 follows a different path, improving an existing engine package through lighter components and chassis development.