smart for two convertable that has a a air noise problem that sounds a top that leaks
Does it leak water or only air?
Has it done this since new?
If this is recent my guess is the seal where the side windows meet the top.
I have never had a quiet convertible.
Your best bet is to look for a convertible top shop in your area. There aren’t as many as there were years ago, but now that the warranty has expired and there are very few Smart dealerships left in The US, I don’t think you have any other recourse. If there are no convertible top shops near you, then perhaps a good body shop could help.