Is there anyway to determine the size of exhaust donut gasket on my car without actually going and taking it off? It looks like available sizes are 2.25" or 2.5".

http://www.autozone.com/autozone/acc...mString=search

I was told this was causing the fluttering sound while driving and possibly affecting some performance. Fact or fiction?

You can measure the outside of the pipe, but being a SE I suspect you have 2.25

I was hoping to be able to order it before getting under the car, but I guess I'll give in and just measure it. I've been putting it off for a while now. Thanks for the help

I picked up the part today, and my hunch is the lady gave me the wrong part. I haven't actually removed the bolts yet (they are soaking in liquid wrench overnight), but it appears the gasket that gets in there is a rubber-like material, and the one she gave me is a hardened metal. This seems odd?

Also, is there anything I need to remove / be aware of before I remove the bolts holding the flange together? This is the one directly behind the engine from the rear of the exhaust manifold