i jest bought a 93 twin turbo and the guy i bought it from says that he took it to the dealer and they told him he needs a new 2ed turbo so i got it cheep but what it does is it is really slow till 3 grand then boost up and takes off but at 5-6 grand it starts to looses boost i guess and slows down is it my turbo or a leak in ppiping or idk guys help me out here what should i do it does not smoke at all it runs pretty good

 

If no smoke, than the turbos are prolly fine. Good luck diagnosing the problem, which lies in the insanely complex control system----it could be one of a million vacuum hoses, check valves, or solenoids. When the stock sequential turbo system isn't working life sucks.