Weird - I just installed a set of flowmasters on my 07GT and was really amazed at the LACK of drone. Yes, there is some, but I honestly had to listen for it - no change rattling around in the cupholders or anything like that. To me, it just seemed like a modest step up from the stock mufflers. The bark is definitely more menacing but really quite mild. I guess some people are more sensitive to it than others. Maybe it's a diff between 07 and 10/11? I know the newer stangs have that feature where they pipe exhaust tone into the cabin.. I also have the stainless steel version of the flows - don't know if that makes a diff though.
BTW - I heard excellent things about the
Corsa, but WOW the price is steep....