upgrade turbo

Hey yall, i have 19' Supri and ive done most of the easy mods already such as: Straightpiped it Mhd Stage 2 Xhp Stage 3 BMC Air Filter Im running 11 sec 1/4 on a non prep street with 100 ron gas and my 100 - 200 is 7 seconds. I wanted to get a upgrade turbo but i want to stick to the stock...

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