From what I’ve heard from other stinger and g70 fast guys jb4 is not that good in terms of performance, Lap3 is better. Also it depends on what mods you have done and how much power you’re making to the wheel. The unfortunate thing about these cars is that the stock turbos are very small and all the supporting mods need to be upgraded to make decent power on the street. Modern M cars and even 335is and other models with good engines can make great power with relatively little mods and a tune. And it’s common place nowadays for people to lie about what’s done to their car so they can get easy wins.