What size bore exhaust 1275

Due to replace my janspeed exhaust due to damage and getting bit rusty. Would a 2" bore be ideal or 1.75" be ok as can get one quite reasonably priced. Car has 95bhp @ wheels
 
Just ordered a 2" janspeed to replace my system from mat Humpris. It's the same as I have now. The system I got is quite bent and flattened. Can't separate the original system as quite old and rusty
 
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