The only real difference is going to be the quality of the materials used, welds etc.
The Topspeed might rust sooner, or not taking weathering quite as well. Other than that, its a single straight piece of pipe, theres not much else to compare.
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| 2015 Nismo headlights| 275/305 | Z1 spacers | Eibach Pro-kit |k&n typhoons | AAM S-Line catback + FI test pipes | Stillen splitter |
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