I would stay far away from ebay for any turbo purchase, theres so many knockoff turbo's there that you wouldnt know what you're getting. Dejon is definetly a safe bet, they've been around 16g's for a long time.

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1993 talon tsi awd - stock on the outside, modded on the inside
2007 solstice gxp - Solo Performance 3" mach exhaust + hiflow cat - dyno sheet