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The term "stainless steel" suggests that the pipes will always maintain their new-like appearance, and that just simply isn't the case. There are dozens of grades of stainless steel on the market, with the most significant characteristics for this application being both nickel and chromium content. For example, a 304 grade ornamental stainless will be much more suited to looking good over time, but it's not a good match for the high heat produced by header pipes. Most automotive exhaust systems today are made from 409 grade stainless which resists rust and corrosion, but just isn't nearly as "pretty" as other grades. It's a classic trade-off between form and function. Not knowing anything about this particular grade of stainless, all I can say is, no single walled pipe will maintain its "new-like" appearance, at least nothing that's affordable or available to you and me. Stainless steel exhausts will typically turn a deep, goldish color in response to the heat. Your friend's bike may be jetted in such a way as to be running cooler, postponing the inevitable change in color. No two bikes are exactly alike, even those of identical make, model, year, etc.
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BMW R1150RT
KTM 250 EXC
Suzuki T500M
Triumph Scrambler
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