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Go ahead and do your OTS tune.
You can customize the burbles but don't do a stage 2 if you have a stock CAT.
all OTS maps are the same. There's just different 'updates'. For example, i have 7.0 S1 on my car, but 7.1 exists.
A tune will not really affect your exhaust sound other than the burble, which is user customizable, but don't do a stage 2 with a stock exhaust system.
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