Find out what size carb you have. It's probably a 14 mil. It should be stamped on the carb body. If it's 14 you'll be fine considering this sounds like your first rodeo into tuning.
Yes treats sells estorils- though he is currently out of stock. They are very good all around pipes. You will lose some bottom end though. Of course if you are more into bottom end power he's also got the proma circuit pipe in stock right now and those are real nice.
Also regardless, you know you'll have to upjet.