We all know a typical “budget” means triple it, so really he has 6k to work with; which means get gtx2860s and all breather mods lol VGs are more knock prone than other engines from roughly the same era, so it’s really important to make sure it doesn’t ping. If you really want 550/600 safely you should spend your money in converting to e85/breather mods. Even a stock turbo e85 breather car can do 500whp these days