Its stainless,I am getting rid of it because I stopped modding my car and I need to save money for college next year. There is not rust on the mufflers and tips because they are stainless, the piping is alittle brown but I wouldnt call it rust. I didnt dyno it but it does feel free'er in high rpms like the rpms feel smoother and faster while peaking. Loudness is alittle bit louder than stromung, It has a nice low burble especially when at idle. |