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the reason im asking this is becuase every rb i see with an i exhaust they say its stainless and it sounds so good as all rbs do wen they have an exhaust so im scared by getting a mild steel system it will take the sound of an rb with zorst

Not so much the material, rather the wall thickness of the pipe. Generally all stainless items will be thinner walled than mild and titanium (think mines GTR) is thinner again.

thicker the wall. deeper the note. i personally prefer the thinner wall... if you have ever heard a titanium exhaust you can hear more of a bark. each to there own.

yep, it's the wall thickness of the material that affects the sound though the material density does too. the big effects on sound are bends, mufflers and pipe diameter. but generally speaking mild tends to have a less tinny note than the cheap thin wall stainless exhaust (any of the china bulk produced ones). the japanese stainless systems tend to sound better.

I love the sound of a big mild system too. but also love the sound of a high quality stainless system or a titanium system. they are all different and there are bad exhausts in all types of material.

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