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I have built my own disco potatoe turbo set for about $1000.00 total on OEM Garrett bushing cartridge using Chinese shaft (0.86 AR 76 Trim 53.9 mm dia) and 5 bolts exhaust manifold. I have changed the compressor turbine (0.60 AR, 62 Trim exd.60 mm and ind 46.5 mm) for similar set-up GT2860R which I have made an OEM compressor housing machined to fit this impeller shape. Finally, installed ajustable wastegate actuators which open at 10 psi boost Work great no much lag and they can be rebuid with oversize Garrett kits ! Released 457 RWHP and 397 torque at 17 psi on 94 octane gas...so guess around 475 RWHP at 18 psi max
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