Dear zombie, your idea is very good and I wish you can arrange a discount for the forum members. However I'm not ready to spend so much at present. I only need a gasket and maybe at a later time an air filter as well. But if I can help in any other way for this plan of yours to happen please let me know!
I took off the muffler yesterday. Cleaned it up. Removed rust by using wire brush, rust remover gel, and sandpaper 320grit before painting. it took me about 3.5-4 hours of work from start to finish and had cost me about US$17.
Once I have the gasket I'll remove and paint the pipe as well.