If its the noise of the exhaust inside your RST thats bothering you, then you could buy some sound deadening material such as Dynamat, brown bread, or Brown Brothers cheapo stuff.

This will also help make low profile tyre road noise dissapear, cure ratlles as well as making your car stereo sound shiteloads better!

Kill many, many birds with one stone!

Or you could buy another exhaust!

I know what i'd rather choose!