Don't know what the issues are withe the Flowmaster, but the muffler on the convertible is not the problem. Here's a thread from 8 months ago on changing the convertible exhaust pipe to the one used on the sedans/coupes. A few people here have done this and I've been satisfied. If pure noise is your goal, then a muffler change could be done later. Good luck, - Mark
Convertible exhaust pipe change...
I know there’s nothing likely new or original in what I’m describing here as these cars have been around a long time and have been worked on by many before me. I just thought I’d offer this in case anyone else might be interested. It’s widely known that the convertibles are rated at less...