Okay I have a HKS t4 with the same set up. The hks downpipe I have has a piston ring style copling that presses into the turbo than has to brackets that bolt to the turbo to hold from shooting off look at my website under my pics if the pics don't show good I will try to post some more.
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1985 celica supra upgrading to street/drag well mainly drag. Have complete HKS T4 turbo kit, electronics and all, Getting head port and polish with HKS 264 cams, and port and polished intake with 6 extra injector bungs. Eagle or crower rods? I just bought a 1990 MA70 n/a  . 
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