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Engine + Driveline / e30 differential suitable for turbo

« on: August 06, 2020, 04:33:11 AM »

 i have e30 m42 turbo with stock Getarg transmission and 3.91 differential unfortunately my top speed is 188 km i want change it to reach more speed  but i dont know what differential code will be suitable for me .
does any one can help me or have the same issue ?   
attached picture for 5th gear rpm