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FYI... I just installed an SLP PowerFlo axle-back system on my GT this morning. So, I now have a pair of GT mufflers sitting in my garage if any of you are interested.
I see you have the same wheels that I added to my car. It looks like you have the full cobra on your caps where I picked the large hooded cobra face. Either way they are some very cool looking rims. Not sure what you may be using but I am using Blackfire Wheel Gel and Cleaner with a soft nylon brush which makes clean up a breeze. Good luck on selling the mufflers.