The 200* Ex Duration is common for many twins with a single pipe.This allows the single pipe to work much more effectively.
But swapping to twin pipes I would urge you to have a go at re arranging the port layout to reduce the Ex height.
This worked very well in SeaDoo World Champ class engines when swapping to big twin pipes , but the transfers needed a heap of grinding to get a match to the diffuser efficiency.
Maybe the high port works in your favour though, stopping the big rush of torque from spinning up the drive too quickly ( early ) and loosing traction.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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