I think you are looking for this sub forum.
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are you talking about a guy who asked the same question? because that person is me. i asked the question "Which Red Bull X1 Is Best In GT6 In Terms Of Top Speed Handling And Accel. on off topic and on gt series general as well. and i wanna knwo the answer to that question do you know?
Edit: Hi Andrew--discussion of GT6 should remain in the Gran Turismo forum linked above. Thank you!