5000Audi

well i found a f/s add for a 5000 turbo, and it said the engine was modded for 25 psi boost n whatnot, so i called the guy and asked about the car then i asked about the setup with the boost, he siad he bypassed the fuel cut off after 1.4bar, and put a 25 psi spring int he wastegate...so it got me wondering how did he manage to bypass the fuelcut off?