just had this reply after i sent an email asking about the weld........
"To grind the weld off would weaken the join and invalidate the warrenty,but you could clean it up
with solvol autosol and a small hand held hobby polisher /grinder.
We have not had any problems with customers saying it can be seen after it has been fitted.
The exhaust is in stock and can be sent on Monday.
We have 8 instock today and would pick out the best one should you deside to buy"
Regards
John